Physics 100B - General Physics II » Spring 2022 » Pre-Class 1

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Question #1
A plastic rod is rubbed with a fur. During the rubbing process, the rod acquires a negative charge. What type of charge does the fur acquire?
A.   The fur acquires a positive charge.
B.   The fur remains neutral.
C.   The fur acquires either a negative or positive charge, depending on how hard the rod was rubbed.
D.   The fur also acquires a negative charge.
Question #2
A positively charged rod is brought close to one end of an uncharged metal rod but does not actually touch it. What type of charge does the end of the metal rod closest to the positively charged rod acquire?
A.   The end of the metal rod closest to the positively charged rod remains neutral.
B.   The end of the metal rod closest to the positively charged rod can acquire either a positive or negative charge, depending on the composition of the metal.
C.   The end of the metal rod closest to the positively charged rod acquires a positive charge.
D.   The end of the metal rod closest to the positively charged rod acquires a negative charge.
Question #3
Which of the following statements are true?
A.   A neutral object contains no charge. Two positive charges attract each other. Two negative charges repel each other.
B.   A neutral object contains no charge. Two positive charges attract each other. Electric charge is conserved.
C.   A neutral object contains no charge. Two positive charges attract each other. Electric charge is quantized.
D.   A positive charge and a negative charge attract each other. Two negative charges repel each other. Electric charge is conserved. Electric charge is quantized.
Question #4
A proton and an electron are fixed 1.75 nm apart from each other. What is the force exerted on the electron due to the proton?
A.   9.41 × 108 N, away from the proton
B.   1.32 × 10-19 N, towards the proton
C.   1.32 × 10-19 N, away from the proton
D.   9.41 × 108 N, towards the proton
E.   7.53 × 10-11 N, away from the proton
F.   7.53 × 10-11 N, towards the proton
Question #5
Two charged objects are separated by some distance. The charge on the first object is greater than the charge on the second object. How does the force between the two objects compare?
A.   The charged objects exert electrostatic forces on each other that are equal in magnitude and opposite in direction.
B.   The first object exerts a large electrostatic force on the second object.
C.   The charged objects exert electrostatic forces on each other that are equal in magnitude and pointing in the same direction.
D.   The second object exerts a large electrostatic force on the first object.
Question #6
Two charged objects separated by some distance attract each other. If the charges on both objects are doubled with no change in distance between them, what happens to the magnitude of the force between the objects?
A.   The force between them quadruples.
B.   The force between them also doubles.
C.   The force between them remains unchanged
D.   The force between them is quartered.
E.   The force between them is halved.

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