____1) Which of the following would you expect to be a good insulator? a) Alumin

Question

____1) Which of the following would you expect to be a good insulator?

a) Aluminum b) Copper c) Silver d) Glass e) Steel

_____2) An electric field vector shows the direction of:
a) decreasing electrical potential
b) increasing electrical potential
c) the tangential direction to the equipotential surfaces d) Both a and c

e) Both b and c

______3) A large glass sphere has a charge of 10 %u03BCC at its center. If the charge at the center is doubled, the electric flux through the sphere:

a) Doubles
b) Quadruples
c) Is cut in half

d) Is 1%u20444 as big

e) Stays the same

______4) A positive charge is initially 1 meter from another positive charge. When it is moved closer, which of these values could give the Electric Potential Energy (EPE) of the system before and after the move?

a) -1.5 J --> -2.5 J

b) %u2013 1.5 J --> +1.5 J

c) 0 J --> +1.5 J
d) 0 J --> -1.5 J

e) +1.5 J --> +2.5 J

______5) An equipotential surface near a single negative charge would be: a) A sphere with the charge at its center
b) A plane some distance away from the charge
c) A cylinder with the charge at its center

d) A line through the charge
e) A cube with one side containing the charge

__6) You are trying to light a bulb from the energy stored in a capacitor. Which of the following would NOT increase the amount of energy stored? (In b) through e) voltage across the plates is the same.)

a) Charge the capacitor to a higher voltage
b) Insert a dielectric material with a higher dielectric constant

c) Increase the plate area of the capacitor
d) Increase the separation distance between the plates
e) Use a different capacitor with a higher capacitance

______7) An electric heater consists of a long copper wire (%u03C1=1.68 x 10-8 %u03A9%u2219m) with both ends connected to a 9 volt battery. Which of the following would result in more current in the wire? (Assume all other factors stay constant!)

a) Make the wire longer
b) Increase the wire%u2019s diameter
c) Use a 1.5 V (D-cell) battery
d) Use Iron (%u03C1=9.71 x 10-8 %u03A9%u2219m) wire
e) Insert an ideal ammeter into the circuit.

______8) A %u201C100 watt%u201D light bulb is connected to a 120 V source in your house. The resistance of the filament in this bulb is about:

a) 0.10 %u03A9 b) 0.83 %u03A9 c) 1.2 %u03A9
d) 144 %u03A9 e) 12000 %u03A9

______9) Which of the following is TRUE about a voltmeter? a) Used to measure current

e) Has a fuse to protect it

10)

a) Write a Kirchoff%u2019s loop rule equation for the circuit at right.

b) What is the current in the circuit?

Explanation / Answer

1.d 2.b 3.a 4.e 5.a 6.d 7.b 8.V^2/R=100W R=144 ohms d 9.c

10.Let the current be i.

kirchoffs loop equation:

6-120Xi+12-75i=0

i=18/195=.0923A

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