Multiple Choice
Please mark your responses on the scan tron form
provided.
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1.
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What is the charge on an proton?
a. | positive | b. | negative | c. | neutral |
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2.
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Ohms measure what?
a. | charge | b. | current | c. | voltage | d. | resistance |
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3.
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What is the unit of measurement for current?
a. | volts | b. | amps | c. | ohms | d. | watts |
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4.
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What is the voltage across a 2 ohm resistor carrying 4 Amps of current?
a. | 2 Volts | b. | 6 Volts | c. | 8 volts | d. | 0.25
volts |
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5.
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What is the current through a 5 ohm resistor which has a voltage drop of 20
Volts?
a. | 100 amps | b. | 4 amps | c. | 25 amps | d. | 15
amps |
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6.
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What is the resistance of a heating coil which uses 4 amps of current with
a voltage drop of 12 Volts?
a. | 48 ohms | b. | 16 ohms | c. | 3 ohms | d. | 0.333
ohms |
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7.
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What is the equivalent resistance of a 8 ohm resistor and a 4 ohm resistor in
parallel?
a. | 12 ohms | b. | 2 ohms | c. | 0.5 ohms | d. | 2.66
ohms |
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8.
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What is the equivalent resistance of a 20 ohm resistor and a 60 ohm resistor in
series?
a. | 20 ohms | b. | 80 ohms | c. | 40 ohms | d. | 15
ohms |
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9.
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Opposites attract and likes
a. | attract sometimes, repel sometimes | b. | repel always | c. | attract
always |
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10.
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Which kind of particle can move from one object to another through
charging?
a. | protons | b. | neutrons | c. | electrons | d. | nuclei |
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11.
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An object which is polarized is generally
a. | positive | b. | negative | c. | neutral |
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12.
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An electroscope can detect
a. | electric field | b. | positive charge | c. | negative charge | d. | all of
these |
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13.
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Which is not a method of charging?
a. | neutralization | b. | polarization | c. | induction | d. | contact |
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14.
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The flying fur demonstration shows that
a. | opposites attract | b. | likes repel | c. | charging by
induction | d. | power = voltage x current |
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15.
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Which of the following is not a step in charging by induction?
a. | Grounding | c. | Polarization | b. | Inducting | d. | Charging of source of electric
field |
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16.
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In Coulomb’s law, the letter q stands for
a. | charge | b. | distance | c. | current | d. | capacitance |
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17.
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If you triple the distance between two electric charges, the force between
them
a. | doubles | b. | triples | c. | cuts to one ninth of what it
was | d. | is one-fourth as large as it was |
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18.
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What is the force on a 4 coulomb charge located 4 meters from a -4 coulomb
charge? In the answers that follow, k is the electrostatic constant, not
“kilo.”
a. | - k Newtons | b. | 64 k Newtons | c. | 9k Newtons | d. | - 9k
Newtons |
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19.
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What is the direction of electric field between a piece of fur and the balloon
it charged?
a. | From ballon to fur | c. | both of these | b. | From fur to ballon | d. | neither of
these |
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20.
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What effect explains why the water bent?
a. | Polarization | c. | water is a polar molecule | b. | force is weaker with
increasing distance | d. | all of
these are needed |
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21.
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Which demonstration shows that electric field lines don’t cross?
a. | paper strips on van de graaf | c. | sharp things make smaller sparks
(keys) | b. | bouncing ping-pong ball | d. | Turning the crank faster makes the light bulb
brighter |
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22.
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What is the electric field strength surrounding a small positive 5.0 C charge
experiencing a force of 100 N due to the field?
a. | 500 N/C | c. | 20 N/C | b. | 0.05 N/C | d. | 2500 N/C |
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Problems
(10 points each)
Please mark your answers on the back
of the scan tron from provided. If you need more room to work, write on separate paper, put
your name and class period on both, but do not staple them together.
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23.
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Two resistors, 100 Ohms and 40 Ohms, are connected in parallel. Connected
in series with this section is a single 50 Ohm resistor, which leads to a variable power supply.
An ammeter is attached between the battery and the 50 Ohm resistor. The ammeter reads exactly 2.0
Amps.
a. Draw a schematic diagram showing how this circuit is assembled.
b.
Calculate the voltage setting on the variable power supply.
c. Create a solution chart and fill
in all the other missing values for V, I, R, and P.
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24.
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Explain, in words, why the ping pong ball demonstration behaved as it
did.
Include an illustration that shows the electric field lines around the ping pong ball and the
static generator and pie plate while the ball is between the plate and the generator.
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