Sample Exam I
1. Two point charges are separated by a distance d and feel a force F. What
would the force be if the two
charges are moved a distance 4d apart?
(a) 8N (b) 16N (c) 0.25N (d) 0.75N (e) 0.06 N
2.
Electric field lines
(a) circle clockwise around positive point charges.
(b) move toward negative point charges.
(c) move outward from negative point charges.
(d) circle counterclockwise around positive charges.
3.
If the radius of the wire is doubled, the resistance of the will be
a. quadrupled.
b. doubled.
c. cut in half.
d. remain unchanged.
4. A 24 ohms resistor is connected to a 12-V battery. How much current flows
through the resistor?
(a) 0.5A (b) 0.25A
(c) 2A (d) 1.5A
5. The Voltage delivered to a circuit is 220 V and the current, which
results, is 1/2 A.
The power delivered to the circuit is
(a) 660 W (b) 73 W
(c) 110 W (d) 220 W
6. An electrons was moved 2 cm on the surface of the equipotential that has
potential of 2 V.
Work done on the electron is,
(a) 2 J
(b) 4 J
(c) zero (d)
-2 J
7.
If the distance between the plates of a capacitor is doubled, the
electric field will be
(a) doubled
(b) remain unchanged (c)
decreased by half (a)
increased
8. Calculate the electrical potential for a charge 3.6x10 –9 C
at a spot that is 0.25m away from a charge.
Find the magnitude of the charge.
9. Two charges
q1 = 3 C is located at x= 2 cm from the origin and other charge q2 = -6 C is
located at x= 4 cm.
What is the total electrical potential due both charges at the origin?
10. A
capacitor is to be constructed with parallel plates separated by 3.0 mm and is
to have a capacitance
of 3.0x10–9 F. Calculate the area of each
plate.
11. What is the equivalent capacitance of a series combination of 6, 12, and
36 Farad capacitors?
12. At 283 0C the resistance of a
copper wire was doubled from its original resistance at
What is its temperature
coefficient of resistivity?