1. EMF is an abbreviation of
a)
b)
c)
d)
electromotive force
electrical motive force
electronic motive force
both a and b
Answer : a
2. In which of the following cases is Ohm’s law not applicable?
a)
b)
c)
d)
Electrolytes
Arc lamps
Insulators
Vacuum ratio values
Answer : c
3. SI unit of magnetic induction is
a)
b)
c)
d)
N C-1
tesla
weber
N m A-1
Answer : b
4. Differential form of Gauss’s law in magneto statics is _____________
a)
b)
c)
d)
div B = ρ/εo
div B = 0
div B = -dB/dT
div B = μJ
Answer : b
5. Which of the following laws do not form a Maxwell equation?
a)
b)
c)
d)
Planck’s law
Gauss’s Law
Faraday’s law
Ampere’s Law
Answer : a
6. The divergence of which quantity will be zero?
a)
b)
c)
d)
E
D
H
B
Answer : d
7. Find the Maxwell equation derived from Faraday’s law.
a)
b)
c)
d)
Div(H) = J
Div(D) = I
Curl(E) = -dB/dt
Curl(B) = -dH/dt
Answer : c
8. Find the Maxwell law derived from Ampere law.
a)
b)
c)
d)
Div(I) = H
Div(H) = J
Curl(B) = J
Curl(B) = D
Answer : c
1. Terminal potential difference of battery depends on
a)
b)
c)
d)
current
temperature
both A and B
resistance of external resistor
Answer : d
2. Maximum current a battery of e.m.f 3.0 V and internal resistance 1.0 Ω is
a)
b)
c)
d)
4.0 A
5.0 A
3.0 A
30 A
Answer : c
3. Potential difference across ends of conductor causes loss of
a)
b)
c)
d)
mechanical energy
electrical energy
potential energy
gravitational energy
Answer : b
4. SI unit of potential difference is
a)
b)
c)
d)
kg
Pascal
joule
volt
Answer : d
5. The unit of conductance cannot be expressed in
a)
b)
c)
d)
mho
(ohm)-1
siemens
ohm/m
Answer: d
6. The reciprocal of resistivity of a conductor is
a)
b)
c)
d)
conductance
capacitance
conductivity
none of these
Answer: c
7. Good conductors have many loosely bound
a)
b)
c)
d)
atoms
protons
molecules
electrons
Answer: d
8. With a rise in temperature, the resistance of semiconductors
a)
b)
c)
d)
decreases
increases
first, increase and then decrease
remains constant
Answer: a
9. Whenever there is a change in magnetic flux with respect to an electric conductor or a
coil, an EMF is induced in the conductor is Faraday’s
a)
b)
c)
d)
first law
third law
second law
fourth law
Answer : a
10. Statically induced emf’s magnitude depends on the
a)
b)
c)
d)
Rate of change of flux
Coil resistance
Flux magnitude
None of these
Answer: a
11. Electro motive force induced by motion of conductor across magnetic field is called
a)
b)
c)
d)
EMF
motional EMF
static EMF
rotational EMF
Answer : b
12. Magnetic field is set up in region surrounding the current carrying
a)
b)
c)
d)
rod
wire
blog
plate
Answer : b
13. If a current carrying conductor is placed in uniform magnetic field parallel to direction of
field then the force experienced by conductor will be
a)
b)
c)
d)
ILB × cosθ
ILB
zero
ILB × Sinθ
Answer : c
14. The production of induced current in one coil due to production of current in
neighboring coil is
a)
b)
c)
d)
electromagnetism
induction
mutual induction
steady current
Answer : c
15. What is the SI unit of mutual inductance?
a) Ohm
b) Henry
c) Volt
d) Siemens
Answer : b
16. Mutual inductance between two magnetically coupled coils depends on
a) Permeability of the core material
b) Number of turns of the coils
c) Cross sectional area of their common core
d) All of the above
Answer : d
17. Which of the following circuit elements will oppose the change in circuit current
a)
b)
c)
d)
Capacitance
Inductance
Resistance
All of the above
Answer b
18. The strength of magnetic field is defined as
a) field lines passing through surface
b) electric field lines passing the loop
c) current through surface
d) electrons passing a specific point per unit time
Answer : a
19. Divergence theorem is based on
a) Gauss law
b) Stoke’s law
c) Ampere law
d) Lenz law
Answer : a
20. The Ampere law is based on which theorem?
a) Green’s theorem
b) Gauss divergence theorem
c) Stoke’s theorem
d) Maxwell theorem
Answer : c
1. Calculate the polarisation vector in air when the susceptibility is 5 and electric
field is 12 units.
a) 3
b) 2
c) 60
d) 2.4
Answer: c
2. In isotropic materials, which of the following quantities will be independent of
the direction?
a) Permittivity
b) Permeability
c) Polarisation
d) Polarizability
Answer: a
3. In the given types of polarisation, which type exists in the semiconductor?
a) Electronic
b) Ionic
c) Orientational
d) Interfacial or space charge
Answer: d
4. Solids do not have which type of polarisation?
a) Ionic
b) Orientational
c) Interfacial
d) Electronic
Answer: c
5. Calculate the energy stored per unit volume in a dielectric medium due to
polarisation when P = 9 units and E = 8 units.
a) 1.77
b) 2.25
c) 36
d) 144
Answer: c
1.Faraday’s laws are consequence of the conservation of
(a) charge
(b) energy
(c) magnetic field
(d) both (b) and (c)
Ans(b)
2. Two identical coaxial coils P and Q carrying equal amount of current in the same direction are brought
nearer. The current in
(a) P increases while in Q decreases
(b) Q increases while in P decreases
(c) both P and Q increases
(d) both P and Q decreases
Ans(d)
3.Direction of current induced in a wire moving in a magnetic field is found using
(a) Fleming’s left hand rule
(b) Fleming’s right hand rule
(c) Ampere’s rule
(d) Right hand clasp rule
Ans(b)
4.Lenz’s law is a consequence of the law of conservation of
(a) charge
(b) energy
(c) induced emf
(d) induced current
Ans(b)
5.A solenoid is connected to a battery so that a steady current flows through it. If an iron core is inserted
into the solenoid, the current will
(a) increase
(b) decrease
(c) remain same
(d) first increase then decrease
Ans(b)
6 .The law that the induced e.m.f. and current always oppose the cause producing them is due to
(A) Faraday
(B) Lenz
(C) Newton
(D) Coulomb
Ans(b)
7. An open coil has
(A) Zero resistance and inductance
(B) Infinite resistance and zero inductance
(C) Infinite resistance and normal inductance
(D) Zero resistance and high inductance
Ans(b)
8.Find the force acting on a conductor 3m long carrying a current of 50 amperes at right angles to a
magnetic field having a flux density of 0.67 tesla
(A) 100 N
(B) 400 N
(C) 600 N
(D) 1000 N
Ans(a)
9.. If current in a conductor increases then according to Lenz's law self-induced voltage will
(A) Aid the increasing current
(B) Tend to decrease the amount of current
(C) Produce current opposite to the increasing current
(D) Aid the applied voltage
Ans(c)
10.As per Faraday's laws of electromagnetic induction, an e.m.f. is induced in a conductor whenever it
(A) Lies perpendicular to the magnetic flux
(B) Lies in a magnetic field
(C) Cuts magnetic flux
Ans(c)
(D) Moves parallel to the direction of the magnetic field
11.A 500 turns solenoid develops an average induced voltage of 60 V. Over what time interval must a
flux change of 0.06 Wb occur to produce such a voltage?
(A) 0.01 s
(B) 0.1 s
(C) 0.5 s
(D) 5 s
Ans(c)
12.. A coil induces 350 mV when the current changes at the rate of 1 A/s. The value of inductance is
(A) 3500 mH
(B) 350 mH
(C) 250 mH
(D) 150 mH
Ans(b)
13.. A coil with negligible resistance has 50V across it with 10 mA. The inductive reactance is
(A) 50 ohms
(B) 500 ohms
(C) 1000 ohms
(D) 5000 ohms
Ans(d)
14.What should be the value of primary to the secondary ratio for a transformer to be an isolation
transformer?
a)Equal to one
b)Less than one
c)More than one
d)Equal to 0.5
Ans(a)
15.The average emf induced per turn in a transformer is given by
a)1.11f Φm
b)0.5f Φm
c)4f Φm
d)8f Φm
Ans(c)
16. Which of the following is the expression for Lorentz force?
a) qE
b) q (v X B)
c) ma + qE
d) qE + q (v X B)
Ans(d)
17.The velocity of a charged particle to keep moving in the same direction, in a region where electric
and magnetic fields are perpendicular to each other, is _______________
a) E/B
b) B/E
c) E/B + qE/B
d) B/E + qB/E
Ans(a)
18.Differential form of Gauss’s law in magneto statics is _____________
a) div B = ρ/εo
b) div B = 0
c) div B = -dB/dT
d) div B = μJ
Ans(b)
19.Magnetic field can be produced by ___________
a) Conduction current
b) Displacement current
c) Both conduction and displacement current
d) It is produced naturally
Ans(c)
20.In vacuum or free space, what observations are made?
a) ρ = ρo, J = 0
b) ρ = 0, J = Jo
c) ρ = 0, J = 0
d) ρ = ρo, J = Jo
Ans(c)
21.A point charge of 10 X 10-6 C is at the centre of a cubical Gaussian surface of sides 0.5 m. What is the
flux for the surface?
a) 1.12 X 105 Nm2/C
b) 2.45 X 105 Nm2/C
c) 3.12 X 105 Nm2/C
d) 3.45 X 105 Nm2/C
Ans(d)
22.In an electromagnetic wave, the electric field of amplitude 6.2 V/m oscillates with a frequency of 2.4
X 1010 Hz. The Energy density of the wave is __________
a) 1.4 X 10-10J/m3
b) 2.4 X 10-10J/m3
c) 3.4 X 10-10J/m3
d) 4.4 X 10-10J/m3
Ans(c)
23.Which of the following is the expression for the continuity equation?
a) ρ + J = 0
b) dρ/dt + div.J = 0
c) dρ/dt + J = 0
d) ρ + div J = 0
Ans(b)
24.For which body the following variation of E with r is observed?
a) Line of charge
b) Sheet of charge
c) Solid Sphere
d) Spherical Shell
Ans(d)
25.The property of magnetic field to converge electrons is used in microscopes as ___________
a) Magnetic Convergence
b) Magnetic plate
c) Magnetic field
d) Magnetic Lens
Ans(d)
1:
In which of the following cases is Ohm’s law not applicable?
a) Electrolytes
b) Arc lamps
c) Insulators
d) Vacuum ratio values
Answer: c
2:
In a current-voltage relationship graph of a linear resistor, the slope of the graph will
indicate
a) conductance
b) resistance
c) resistivity
d) a constant
Answer: a
3:
Which of the following system follows the differential equation?
a) Semi- Batch process
b) Batch process
c) Fed- Batch process
d) Continuous process
Answer: d
4:
When a spring is compressed or stretched, the potential energy of the spring
___________
a) Decreases
b) Stays constant
c) Increases
d) Becomes zero
Answer: c
5:
Which of the following is the expression for Lorentz force?
a) qE
b) q (v X B)
c) ma + qE
d) qE + q (v X B)
Answer: d
Electrodynamics.
Mcqs.
1. Ohm's law is applicable to
A. Semiconductors
B. Vacuum tubes
C. Carbon resistors
D. None of these
Answer.D
2. The condition for the validity of Ohm's law is that the
A. Temperature should remain constant
B. Current should be proportional to voltage
C. Resistance must be wire wound type
D. All of the above
Answer A
3. Ohm's law is not applicable to
A. Semiconductors
B. D.C. circuits
C. Small resistors
D. High currents
Answer. A
4. Correct form of ohm's law
A. I = VR
B. V ∝ I
C. V = IR
D. Above B and C
Answer. D
5. Ohm's law in point form in field theory can be expressed as
A. V = RI
B. J = E/σ
C. J = σE
D. R = ρl/A
Answer.c
Which method can be used for absolute measurement of resistances ?
(A)Ohm's law method
(B)Wheatstone bridge method
(C)Releigh method
(D) Lortentz method.
Answer.B
Three 3 ohm resistors are connected to form a triangle. What is the resistance between any
two of the corners?
(A) 3 / 4 ohms
(B) 3 ohms
(C) 2 ohms
(D) 4/3 ohm.
Answer.c
How many different combinations may be obtained with three resistors, each having the
resistance R?
(A) 3
(B) 4
(C) 5
(D) 6.
Answer.B
A wire of 0.14 mm diameter and specific resistance 9.6 micro ohm-cm is 440 cm long. The
resistance of the wire will be
(A) 9.6 ohm
(B) 11.3 ohm
(C) 13.7 ohm
(D) 27.4 ohm.
Answer.D
.Ohm's law is not applicable to
(A) DC circuits
(B) high currents
(C) small resistors
(D) semi-conductors.
Answer.D
A metal resistor has resistance of 10 ohm at 0°C and 11 ohms at 160°C, the temperature
coefficient is
(A) 0.00625 / °C
(B) 0.0625 /°C
(C) 0.000625 /°C
(D) 0.625 /°C.
Answer.c
1. Who introduced the right-hand rule for determining the direction of the induced EMF?
a.
b.
c.
d.
Fleming
Lenz
Maxwell
Faraday
Answer: (a) Fleming
2. Whenever there is a change in magnetic flux with respect to an electric conductor or a
coil, an EMF is induced in the conductor is Faraday’s
a.
b.
c.
d.
first law
third law
second law
fourth law
Answer: (a) first law
3.
In which device is the principle of statically induced emf used?
a.
b.
c.
d.
Transformer
Motor
Generator
Battery
Answer: (a) Transformer
4. Statically induced emf’s magnitude depends on the
a.
b.
c.
d.
Rate of change of flux
Coil resistance
Flux magnitude
None of these
Answer: (a) Rate of change of flux
5.
An E.M.F. can be induced by _________
a) Change in the magnetic field only
b) Change in the area of cross section only
c) Change in angle between magnetic field and area only
d) Change in the magnetic field, area or angle between them
Answer: (d)
6. What happens to the current in a coil while accelerating a magnet inside it?
a) Increases
b) Decreases
c) Remains constant
d) Reverses
Answer: (a)
7. The total number of magnetic field lines passing through an area is termed as?
a) Voltage
b) EMF
c) Magnetic flux
d) Magnetic flux density
Answer: (c)
8.
The formula for induced emf if magnetic field, length and velocity of
conductor all are mutually perpendicular is __________
a) emf=B2l
b) emf=Bil
c) emf=Blv
d) emf=B2v
Answer: (c)
1. The divergence of which quantity will be zero?
a) E
b) D
c) H
d) B
Ans: D
2. Find the Maxwell equation derived from Faraday’s law.
a) Div (H) = J
b) Div (D) = I
c) Curl (E) = -dB/dt
d) Curl (B) = -dH/dt
Ans: C
3. Which is the property of a coil by which a counter emf is induced when the current through the coil
changes?
a) Self-inductance
b) Mutual inductance
c) Capacitance
d) None of these
Ans: A
4. Ohm’s law is not applicable to _____
a) Dc circuits
b) High currents
c) Small resistors
d) Semi-conductors
Ans: D
5. Resistivity of a wire depends on _____
a) Length of wire
b) Cross section area
c) Material
d) All of the mentioned
Ans: C
1. Which of the following is the expression for Lorentz force?
a) qE
b) q (v X B)
c) ma + qE
d) qE + q (v X B)
Answer: d
2. The velocity of a charged particle to keep moving in the same direction, in a region where electric and
magnetic fields are perpendicular to each other, is _______________
a) E/B
b) B/E
c) E/B + qE/B
d) B/E + qB/E
Answer: a
3. The entire theory of electromagnetic waves is contained in Maxwell’s equations.
a) True
b) False
Answer: a
4. Differential form of Gauss’s law in magneto statics is _____________
a) div B = ρ/εo
b) div B = 0
c) div B = -dB/dT
d) div B = μJ
Answer: b
5. Magnetic field can be produced by ___________
a) Conduction current
b) Displacement current
c) Both conduction and displacement current
d) It is produced naturally
Answer: c
6. In vacuum or free space, what observations are made?
a) ρ = ρo, J = 0
b) ρ = 0, J = Jo
c) ρ = 0, J = 0
d) ρ = ρo, J = Jo
Answer: c
7. A point charge of 10 X 10-6 C is at the centre of a cubical Gaussian surface of sides 0.5 m. What is the
flux for the surface?
a) 1.12 X 105 Nm2/C
b) 2.45 X 105 Nm2/C
c) 3.12 X 105 Nm2/C
d) 3.45 X 105 Nm2/C
Answer: a
8. In an electromagnetic wave, the electric field of amplitude 6.2 V/m oscillates with a frequency of 2.4 X
1010 Hz. The Energy density of the wave is __________
a) 1.4 X 10-10J/m3
b) 2.4 X 10-10J/m3
c) 3.4 X 10-10J/m3
d) 4.4 X 10-10J/m3
Answer: c
9. Which of the following is the expression for the continuity equation?
a) ρ + J = 0
b) dρ/dt + div.J = 0
c) dρ/dt + J = 0
d) ρ + div J = 0
Answer: b
9. EMF is an abbreviation of
e)
f)
g)
h)
electromotive force
electrical motive force
electronic motive force
both a and b
Answer : a
10. In which of the following cases is Ohm’s law not applicable?
e)
f)
g)
h)
Electrolytes
Arc lamps
Insulators
Vacuum ratio values
Answer : c
11. SI unit of magnetic induction is
e)
f)
g)
h)
N C-1
tesla
weber
N m A-1
Answer : b
12. Differential form of Gauss’s law in magneto statics is _____________
e)
f)
g)
h)
div B = ρ/εo
div B = 0
div B = -dB/dT
div B = μJ
Answer : b
13. Which of the following laws do not form a Maxwell equation?
e)
f)
g)
h)
Planck’s law
Gauss’s Law
Faraday’s law
Ampere’s Law
Answer : a
14. The divergence of which quantity will be zero?
e)
f)
g)
h)
E
D
H
B
Answer : d
15. Find the Maxwell equation derived from Faraday’s law.
e)
f)
g)
h)
Div(H) = J
Div(D) = I
Curl(E) = -dB/dt
Curl(B) = -dH/dt
Answer : c
16. Find the Maxwell law derived from Ampere law.
e)
f)
g)
h)
Div(I) = H
Div(H) = J
Curl(B) = J
Curl(B) = D
Answer : c
1. An E.M.F. can be induced by _________
a) Change in the magnetic field only
b) Change in the area of cross section only
c) Change in angle between magnetic field and area only
d) Change in the magnetic field, area or angle between them
Answer: d
2. What happens to the current in a coil while accelerating a magnet inside it?
a) Increases
b) Decreases
c) Remains constant
d) Reverses
Answer: a
3. What is the consequence of motor effect?
a) Current
b) Voltage
c) Electromagnetic induction
d) EMF
Answer: c
4. The total number of magnetic field lines passing through an area is termed as?
a) Voltage
b) EMF
c) Magnetic flux
d) Magnetic flux density
Answer: c
5. If a conductor 0.2m long moves with a velocity of 0.3m/s in a magnetic field of
5T, calculate the emf induced if magnetic field, velocity and length of conductor
are mutually perpendicular to each other.
a) 0.3V
b) 0.03V
c) 30V
d) 3V
Answer: a
1. Which of the following is the expression for Lorentz force?
a) qE
b) q (v X B)
c) ma + qE
d) qE + q (v X B)
View Answer
Answer: d
Explanation: Lorentz force is the force on a particle when it moves through a
medium where both magnetic and electric fields are present.
2. The velocity of a charged particle to keep moving in the same direction, in a
region where electric and magnetic fields are perpendicular to each other, is
_______________
a) E/B
b) B/E
c) E/B + qE/B
d) B/E + qB/E
View Answer
Answer: a
Explanation: As we know, Lorentz force = qE + q (v X B).
Now, as we know, for the particle to move in same direction, the net force on it
should be zero.
Therefore, qE + q (v X B) = 0
Solving for v, we get, v = E/B.
3. The entire theory of electromagnetic waves is contained in Maxwell’s equations.
a) True
b) False
View Answer
Answer: a
Explanation: Maxwell’s equation is a set of four equations with the help of which,
every concept of Maxwell’s equation can be solved and understood.
4. Differential form of Gauss’s law in magneto statics is _____________
a) div B = ρ/εo
b) div B = 0
c) div B = -dB/dT
d) div B = μJ
View Answer
Answer: b
Explanation: Gauss’s law in magneto statics states that the surface integration of
magnetic field over a closed surface is zero. Its differential form is: div B = 0.
5. Magnetic field can be produced by ___________
a) Conduction current
b) Displacement current
c) Both conduction and displacement current
d) It is produced naturally
View Answer
Answer: c
Explanation: Earlier it was believed it was believed that only the conduction current
could produce magnetic field. Later, Maxwell showed that displacement current can
also produce magnetic field. It was known as Maxwell-Ampere law.
1. For which body the following variation of E with r is observed?
a) Line of charge
b) Sheet of charge
c) Solid Sphere
d) Spherical Shell
Answer: d
2. The property of magnetic field to converge electrons is used in microscopes as
___________
a) Magnetic Convergence
b) Magnetic plate
c) Magnetic field
d) Magnetic Lens
Answer: d
3. If the velocity of a charged particle in perpendicular electric and magnetic field is
7.27 X 106m/s and the Electric field is 6 X 106 N/c, what should be the value of
magnetic field for velocity sector?
a) 0.45 T
b) 0.78 T
c) 0.83 T
d) 0.94 T
Answer: c
4. Which of the following laws do not form a Maxwell equation?
a) Planck’s law
b) Gauss’s Law
c) Faraday’s law
d) Ampere’s Law
Answer: a
5. In vacuum or free space, what observations are made?
a) ρ = ρo, J = 0
b) ρ = 0, J = Jo
c) ρ = 0, J = 0
d) ρ = ρo, J = Jo
Answer: c
6. A point charge of 10 X 10-6 C is at the centre of a cubical Gaussian surface of sides
0.5 m. What is the flux for the surface?
a) 1.12 X 105 Nm2/C
b) 2.45 X 105 Nm2/C
c) 3.12 X 105 Nm2/C
d) 3.45 X 105 Nm2/C
Answer: a
7. In an electromagnetic wave, the electric field of amplitude 6.2 V/m oscillates with
a frequency of 2.4 X 1010 Hz. The Energy density of the wave is __________
a) 1.4 X 10-10J/m3
b) 2.4 X 10-10J/m3
c) 3.4 X 10-10J/m3
d) 4.4 X 10-10J/m3
Answer: c
8. Which of the following is the expression for the continuity equation?
a) ρ + J = 0
b) dρ/dt + div.J = 0
c) dρ/dt + J = 0
d) ρ + div J = 0
Answer: b
9. Differential form of Gauss’s law in magneto statics is _____________
a) div B = ρ/εo
b) div B = 0
c) div B = -dB/dT
d) div B = μJ
Answer: b
10. Magnetic field can be produced by ___________
a) Conduction current
b) Displacement current
c) Both conduction and displacement current
d) It is produced naturally
Answer: c
1) A photodiode should be chosen with a …………. Less than photon
energy:
a) Direct absorption
b) Band gap energy
c) Wavelength range
d) Absorption coefficient
Answer: d
2) The absorption coefficient of semiconductor materials is strongly
dependent on:
a) Properties of material
b) Wavelength
c) Amount of light
d) Amplitude
Answer: b
3) The absorption of photon in a photodiode is dependent on:
a) Absorption coefficient
b) Properties of materials
c) Charge carrier at junction
d) Amount of light
Answer: a
4) ………. Photodiodes have large dark currents:
a) GaAs
b) Silicon
c) GaSb
d) Germanium
Answer: c
5) Which of the following expression for Lorentz force?
a) qE
b) q (v×B)
c) ma + qE
d) qE + q (v × B)
Answer: d
6) Magnetic field can be produced by:
a) Conduction current
b) Displacement current
c) Both conduction and displacement current
d) It is produced naturally
Answer: c
7) Which of the following laws do not form Maxwell’s equation?
a) Plank’s law
b) Gauss’s law
c) Faraday’s law
d) Ampere’s law
Answer: a
8) What should be the phase difference between two plane- polarized
waves, vibrating at right angles to each other, to produce circularly
polarized light?
𝜋
a)
6
𝜋
b)
c)
d)
2
𝜋
4
𝜋
3
Answer: b
Mcqs for electrodynamics
1. The phenomenon employed in the waveguide operation is
a) Reflection
b) Refraction
c) Total internal reflection
d) Adsorption
Answer: c
2. The waveguides are materials with characteristics of
a) Low bulk resistivity
b) High bulk resistivity
c) High conductivity
d) Low conductivity
Answer: a
3. The waveguide is employed in the transmission lines, when operated at the range of
a) Hz
b) KHz
c) MHz
d) GHz
Answer: d
4. In a waveguide, always which condition holds good?
a) phase velocity = c
b) phase velocity greater than c
c) phase velocity lesser than c
d) group velocity = c
Answer: b
5. The dominant mode in waveguide is the mode which has
a) Highest frequency
b) Highest wavelength
c) Lowest phase constant
d) Highest attenuation
Answer: b