Electro Statics
Important Short Answer Questions
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
Define Electric flux density?
State Gauss’s Law?
Define Electric Potential?
Define Energy density in Electro static fields?
Define Conduction and Convection currents?
Define Dielectric constant?
Write Continuity of current equation?
What is relaxation time?
Write Poisson’s and Laplace’s Equations?
Write the two Maxwell’s Equations for Electro static fields?
Important Long Answer Questions
1. (a). Derive the Expression for Electric field due to an Infinite Line Charge Using Coulomb’s law?
(b). A Circular ring of radius a carries a uniform charge of ρL C/m and is placed on xy-plane with its axis
as the z-axis. (i) Show that E(0,0,h)=
2.
3.
4.
5.
𝜌𝐿 𝑎ℎ
z.
2∈0 [ℎ2 +𝑎2 ]3/2
a
(ii) What values of h gives the maximum value of E?
Apply Gauss’s Law to find Electric flux density due to a point, an infinite line, an Infinite surface and a
uniformly charged sphere?
(a).Two point charges -4µc and 5µc are located at (2,-1,3) and (0,4,-2) respectively. Find the potential at
(1,0,1), assuming zero potential at infinity?
(b). Obtain the relation between Electric field and potential.
(a).Derive Continuity of Current Equation and Relaxation time.
(b). Derive Poisson’s and Laplace’s Equations?
Derive the Expressions for Parallel plate, Coaxial and Spherical capacitors?
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Magneto Statics
Important Short Answer Questions
1.
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3.
4.
5.
6.
7.
8.
9.
10.
State Biot-Savart’s Law?
Define Ampere’s Law?
Define Magnetic flux density?
Define Scalar magnetic potential?
Define Vector magnetic potential?
What is the force on a charged particle?
What is the force on a current element?
What is the force between two current elements?
What is the relation between Magnetic flux and Magnetic vector potential ?
Write the two Maxwell’s Equations for Magneto static fields?
Important Long Answer Questions
1. (a). Derive the Expression for Magnetic field due to an Infinite line current Using Biot-Savart’s Law?
(b).The conducting triangular loop as shown in the figure carries a current of 10A. Find H at (0,0,5) due
to side 1 of the loop?
2. (a). Apply Ampere’s Law to derive the Magnetic field due to infinite line current, infinite sheet of
current?
(b). Two planes z=0 and z=4 carry current K= -10ax A/m and K= 10ax A/m respectively. Determine H at
(a) (1,1,1) (b) (0,-3,10)?
3. Apply Ampere’s Law to derive the Magnetic field due to infinite long coaxial cable?
4. Explain different Magnetic Forces and Potentials?
5. Explain Maxwell’s Equations in final forms for Static fields.
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