CP2 exam 2 MC Exam Questions With
Correct Answers
A solid silver cube rests on a wooden table in a region where a uniform external
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electric field is directedhorizontally from right to left. What can be said
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concerning the charge on the left-hand surface of thecube? - CORRECT
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ANSWER✔✔-The left-hand surface is charged positively. | | | | |
When a current flows through an ionic liquid such as salt water, the moving
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charges are - CORRECT ANSWER✔✔-both positive and negative ions.
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A positively charged aluminum rod is brought in contact with an initially neutral
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metallic sphere that isinsulated from ground. It is in contact with the sphere for a
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few seconds, and then is separated from thesphere by a small distance. After the
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rod is separated, the rod - CORRECT ANSWER✔✔-is repelled by the sphere.
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A negatively charged plastic rod is brought close to (but does not touch) two
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neutral metallic spheres thatare in contact with each other but insulated from the
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ground. If the two spheres are then separated, whatkind of charge will be on the
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spheres? - CORRECT ANSWER✔✔-The sphere near the charged rod becomes
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positive and the other one becomes negative.
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You are given a glass bar of dimensions 10 cm × 5 cm × 2 cm and asked to attach
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wires to it in order tomake a resistor. If you want to achieve the largest possible
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resistance, you should attach the leads to theopposite faces that measure -
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CORRECT ANSWER✔✔-5 cm × 2 cm | | | | |
, Two tiny beads are 5 cm apart with no other charges or fields present. Bead A
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carries -40 μC of charge andbead B carries +8 μC. Which one of the following
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statements is true about the magnitudes of the electricforces on these beads? -
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CORRECT ANSWER✔✔-the force on A is exactly equal to the force on B.
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The electron-volt is a unit of - CORRECT ANSWER✔✔-energy.
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A capacitor initially has a charge Q on it. As the charge is decreased to Q/4 what
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happens to thecapacitance and the electric field between the plates? - CORRECT
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ANSWER✔✔-The capacitance is constant and the electric field decreases. | | | | | | | |
A capacitor is connected to a battery until it has charge Q. It is then disconnected
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from the battery,maintaining the charge on each plate. A dielectric material is
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introduced between the plates. Which ofthe following is true? - CORRECT
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ANSWER✔✔-The capacitance increases and the potential difference decreases.
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A parallel plate capacitor has horizontal plates. The top plate has a positive
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charge, and the bottom platehas a negative charge. What is the direction of the
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electric field in the capacitor - CORRECT ANSWER✔✔-Down
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An electron is placed at rest in a uniform electric field. After it is released, what
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can be said about themotion of the electron and its energy? - CORRECT
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ANSWER✔✔-It moves in the direction opposite the electric field, toward
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decreasing potential energy | |
Correct Answers
A solid silver cube rests on a wooden table in a region where a uniform external
| | | | | | | | | | | | | | | |
electric field is directedhorizontally from right to left. What can be said
| | | | | | | | | | | |
concerning the charge on the left-hand surface of thecube? - CORRECT
| | | | | | | | | | |
ANSWER✔✔-The left-hand surface is charged positively. | | | | |
When a current flows through an ionic liquid such as salt water, the moving
| | | | | | | | | | | | | |
charges are - CORRECT ANSWER✔✔-both positive and negative ions.
| | | | | | | |
A positively charged aluminum rod is brought in contact with an initially neutral
| | | | | | | | | | | | |
metallic sphere that isinsulated from ground. It is in contact with the sphere for a
| | | | | | | | | | | | | | |
few seconds, and then is separated from thesphere by a small distance. After the
| | | | | | | | | | | | | |
rod is separated, the rod - CORRECT ANSWER✔✔-is repelled by the sphere.
| | | | | | | | | | |
A negatively charged plastic rod is brought close to (but does not touch) two
| | | | | | | | | | | | | |
neutral metallic spheres thatare in contact with each other but insulated from the
| | | | | | | | | | | |
ground. If the two spheres are then separated, whatkind of charge will be on the
| | | | | | | | | | | | | | | |
spheres? - CORRECT ANSWER✔✔-The sphere near the charged rod becomes
| | | | | | | | | |
positive and the other one becomes negative.
| | | | | |
You are given a glass bar of dimensions 10 cm × 5 cm × 2 cm and asked to attach
| | | | | | | | | | | | | | | | | | | |
wires to it in order tomake a resistor. If you want to achieve the largest possible
| | | | | | | | | | | | | | | |
resistance, you should attach the leads to theopposite faces that measure -
| | | | | | | | | | | |
CORRECT ANSWER✔✔-5 cm × 2 cm | | | | |
, Two tiny beads are 5 cm apart with no other charges or fields present. Bead A
| | | | | | | | | | | | | | | |
carries -40 μC of charge andbead B carries +8 μC. Which one of the following
| | | | | | | | | | | | | | |
statements is true about the magnitudes of the electricforces on these beads? -
| | | | | | | | | | | | |
CORRECT ANSWER✔✔-the force on A is exactly equal to the force on B.
| | | | | | | | | | | |
The electron-volt is a unit of - CORRECT ANSWER✔✔-energy.
| | | | | | | |
A capacitor initially has a charge Q on it. As the charge is decreased to Q/4 what
| | | | | | | | | | | | | | | | |
happens to thecapacitance and the electric field between the plates? - CORRECT
| | | | | | | | | | | |
ANSWER✔✔-The capacitance is constant and the electric field decreases. | | | | | | | |
A capacitor is connected to a battery until it has charge Q. It is then disconnected
| | | | | | | | | | | | | | | |
from the battery,maintaining the charge on each plate. A dielectric material is
| | | | | | | | | | | |
introduced between the plates. Which ofthe following is true? - CORRECT
| | | | | | | | | | |
ANSWER✔✔-The capacitance increases and the potential difference decreases.
| | | | | | |
A parallel plate capacitor has horizontal plates. The top plate has a positive
| | | | | | | | | | | | |
charge, and the bottom platehas a negative charge. What is the direction of the
| | | | | | | | | | | | | |
electric field in the capacitor - CORRECT ANSWER✔✔-Down
| | | | | | |
An electron is placed at rest in a uniform electric field. After it is released, what
| | | | | | | | | | | | | | | |
can be said about themotion of the electron and its energy? - CORRECT
| | | | | | | | | | | | |
ANSWER✔✔-It moves in the direction opposite the electric field, toward
| | | | | | | | | |
decreasing potential energy | |
