Three charges q1= 3.4 x 10-7 C, q2= -4.5 x 10-7 C, and q3= -5.3 x 10-7 C are
placed at the corners of a right triangle as shown in the figure on the right.
What is the net electric force acting upon q1?
A. 2.350 x 10-4 N
B. 2.175 x 10-4 N
C. 2.264 x 10-4 N
D. 2.570 x 10-4 N
Based on the previous item, what would be the electric field on q1?
A. 755.882 N/C
B. 665.882 N/C
C. 639.706 N/C
D. 691.176 N/C
Two point charges q1 and q2 with the same magnitude 5.20 x 10-6 C are placed on the x-axis at x= -3.50 m and
x= 3.50 m respectively. What charge q must be placed at the origin such that the electric field vanishes or
equal to zero at x= 0, y= 3.0 m?
A. -4.100 x 10-6 C
B. -4.405 x 10-6 C
C. 4.404 x 10-6 C
D. none of the above
Assume a spherically symmetric charge with a radius of 0.76 m and a charge density ρ. What is the electric
field at point P which is 0.035 m above the surface of the sphere?
A. 4.048 x 1013 ρN(C)-1
B. 7.847 x1010 ρN(C)-1
C. 2.612 x 1010 ρN(C)-1
D. 5.162 x 1010 ρN(C)-1
Suppose a car battery that moves 65,000 C of charge and transfers 835 kJ of energy, what is the electric
potential supplied by the car battery?
A. 77.844 V
B. 5.428 x 107 V
C. 12.846 V
D. 1.285 x 10-2 V
Consider a dipole on the xy-coordinate plane as shown in the figure
on the right. What is the electric potential at (5,2)?
A. 1.805 x 104 V
B. 6.115 x 103 V
C. 0 V
D. 2.675 x 104 V
5
4
q= +4.25 x 10-6 C
3
2
1
1
2
3
4
5
q= -4.25 x 10-6 C
Consider a ring with a diameter of 1.5 cm and a charge density of 25 C/m, what is the electric potential at a
point 0.1 cm above the center of the disc?
A. 1.409 x 1012 V
B. 1.982 x 1012 V
C. 9.393 x 1010 V
D. 1.400 x 1012 V
Given a charged ring with a radius of 0.05 m and a charge density of 30
C/m, what is the electric field at a point P, 0.25 m above the center of the
ring such as shown in the figure on the right? (The electric field along the zaxis of the ring is
A.
B.
C.
D.
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6.574 x 10-10 V/m
1.213 x 1012 V/m
1.278 x 1012 V/m
None of the above
Considering a parallel plate capacitor with metal plates that have an area of 1.20 cm2 and are separated by a
distance of 0.23 mm, what is the capacitance of such capacitor?
A. 4.690 x 1011 F
B. 4.617 x 10-10 F
C. 4.617 x 10-12 F
D. 1.696 x 10-13 F
Given that C1= 1.0 µF, C2= 2.0 µF, C3= 4.0 µF, and C4= 8.25 µF,
what is the equivalent capacitance of the network of
capacitors shown in the figure?
A. 15.250 µF
B. 2.981 µF
C. 3.787 µF
D. 9.964 µF
If the voltage maintained in this network of capacitors is 3.0 V as shown in the
figure; and C1= 4.0 F such that it carries 5.30 C of charge and C2= 3.5 F, what is
the potential difference across C3?
A. 1.093 V
B. 0.350 V
C. 2.758 V
D. 1.675 V
Consider a parallel network of capacitors, C1= 4.0 F and C2= 3.5 F, as shown in the
figure on the right that is supplied with 12.0 V potential difference. What is the
amount of energy stored in C1?
A. 288 J
B. 576 J
C. 72 J
D. 24 J
C1
C3
C2
C1
C2
Given an empty parallel plate capacitor wherein the parallel plates have a charge density of 5.0 C/m2 and
are separated by a distance of 2.0 m. What is the energy density between the two plates?
A. 5 J/m3
B. 1.412 x 1012 J/m3
C. 7.062 x 1011 J/m3
D. 5.650 x 1012 J/m3
The current needed to operate a calculator can be as small as 0.345 mA. How much charge is moved by a
calculator in 3.55 s?
A. 1.225 x 10-3 C
B. 9.718 x 10-2 C
C. 1.029 x 101 C
D. 2.738 x 10-5 C
Assume a gold wire with a resistance of 0.025 Ω at 200 C. What is the resistance of the gold wire if the
temperature is increased to 26700 C given that the temperature coefficient of gold is 0.0034 (0C)-1?
A. 2.295 Ω
B. 0.252 Ω
C. 0.200 Ω
D. 0.250 Ω
Given a resistor attached to 4.7 V battery where the current measured across the resistor is 3.50 mA at 200
C, what is the resistance of the resistor?
A. 1342.857 Ω
B. 744.681 Ω
C. 6311.429 Ω
D. 383673.469 Ω
When a DC winch motor is running at its maximum power, it can lift an object with a weight of 5013.20 N at
a distance of 12.0 m in 4.5 s in constant speed. What is the power needed by the motor to lift the object
ignoring air resistance?
A. 13.368 kW
B. 1.880 kW
C. 10.152 kW
D. 18.800 kW