Pre-Class 4

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Question #1

A parallel-plate capacitor connected to a battery becomes fully charged. After the capacitor from the battery is disconnected, the separation between the plates of the capacitor is doubled in such a way that no charge leaks off. How is the energy stored in the capacitor affected?

A The energy stored in the capacitor is decreased to one-fourth of its original value.

B The energy stored in the capacitor is decreased to one-half of its original value.

C The energy stored in the capacitor remains constant.

D The energy stored in the capacitor quadruples its original value.

E The energy stored in the capacitor doubles its original value.

Question #2

The voltage applied across a given parallel-plate capacitor is doubled. How is the energy stored in the capacitor affected?

A The energy stored in the capacitor quadruples its original value.

B The energy stored in the capacitor is decreased to one-fourth of its original value.

C The energy stored in the capacitor is decreased to one-half of its original value.

D The energy stored in the capacitor remains constant.

E The energy stored in the capacitor doubles its original value.

Question #3

A dielectric material, such as Teflon®, is placed between the plates of a parallel-plate capacitor without altering the structure of thecapacitor. The charge on the capacitor is held fixed. How is the electric field between the plates of the capacitor affected?

A The electric field becomes infinite because of the insertion of the Teflon®

B The electric field is not altered, because the structure remains unchanged.

C The electric field decreases because of the insertion of the Teflon®

D The electric field increases because of the insertion of the Teflon®

E The electric field becomes zero after the insertion of the Teflon®

Question #4

A dielectric material, such as Teflon®, is placed between the plates of a parallel-plate capacitor without altering the structure of the capacitor. The charge on the capacitor is held fixed. How is the voltage across the plates of the capacitor affected?

A The voltage is not altered, because the structure remains unchanged.

B The voltage increases because of the insertion of the Teflon®

C The voltage becomes zero after the insertion of the Teflon®

D The voltage becomes infinite because of the insertion of the Teflon®

E The voltage decreases because of the insertion of the Teflon®

Question #5

If a dielectric material, such as Teflon®, is placed between the plates of a parallel-plate capacitor without altering the structure of thecapacitor, how is the capacitance affected?

A The capacitance decreases because of the insertion of the Teflon®

B The capacitance increases because of the insertion of the Teflon®

C The capacitance becomes infinite after the insertion of the Teflon®

D The capacitance is not altered, because the structure remains unchanged.

E The capacitance becomes zero after the insertion of the Teflon®

Question #6

Which of the following statements are true?

A After the space between the two conductors in a capacitor is filled with a dielectric material, the capacitance of the capacitor decreases. The insertion of a dielectric material between the two conductors in a capacitor allows the plates of the capacitor to be placed
closer together without touching.

B The insertion of a dielectric material between the two conductors in a capacitor allows a higher voltage to be applied to the capacitor. The insertion of a dielectric material between the two conductors in a capacitor allows the plates of the capacitor to be placed closer together without touching.

C The insertion of a dielectric material between the two conductors in a capacitor allows a higher voltage to be applied to the
capacitor. Dielectrics allow electric charge to flow as easily as they do in air.

D After the space between the two conductors in a capacitor is filled with a dielectric material, the capacitance of the capacitor decreases. Dielectrics allow electric charge to flow as easily as they do in air.

Question #7

The plates of a parallel-plate capacitor are maintained with a constant voltage by a battery as they are pushed together, without touching.How is the amount of charge on the plates affected during this process?

A The amount of charge on the plates decreases during this process.

B The amount of charge on the plates becomes zero.

C The amount of charge on the plates increases during this process.

D The amount of charge remains constant.

Question #8

The plates of a parallel-plate capacitor are maintained with a constant voltage by a battery as they are pulled apart. How is the strength of the electric field affected during this process?

A The strength of the electric field remains constant.

B The strength of the electric field increases during this process.

C The electric field between the plates becomes zero.

D The electric field between the plates becomes infinite.

E The strength of the electric field decreases during this process.

Question #9

Which of the following will increase the capacitance of a parallel-plate capacitor?

A Increasing the area of the plates will increase the capacitance of a parallel-plate capacitor. Decreasing the separation between the plates will increase the capacitance of a parallel-plate capacitor.

B Decreasing the area of the plates will increase the capacitance of a parallel-plate capacitor. Increasing the separation between the plates will increase the capacitance of a parallel-plate capacitor.

C Increasing the separation between the plates will increase the capacitance of a parallel-plate capacitor. Decreasing the separation between the plates will increase the capacitance of a parallel-plate capacitor.

D Decreasing the area of the plates will increase the capacitance of a parallel-plate capacitor. Increasing the area of the plates will increase the capacitance of a parallel-plate capacitor.

Question #10

Which of the following statements are true?

A A capacitor is a device that stores electric potential energy and electric charge. The electric field between the plates of a parallel-plate capacitor is uniform. The capacitance of a capacitor depends upon its structure.

B A capacitor consists of a single sheet of a conducting material placed in contact with an insulating material. A capacitor is a device that stores electric potential energy and electric charge.

C A capacitor consists of a single sheet of a conducting material placed in contact with an insulating material. The electric field between the plates of a parallel-plate capacitor is uniform.

D The capacitance of a capacitor depends upon its structure. A capacitor consists of a single sheet of a conducting material placed in contact with an insulating material.

Question #11

A capacitor with capacitance (C) = 4.50 μF is connected to a 12.0 V battery. What is the magnitude of the charge on each of the plates?

A 4.50×10−4 C

B 5.40×10−5 C

C 4.40×10−3 C

D 3.50×10−5 C

Question #12

A parallel-plate capacitor is connected to a battery. After it becomes charged, the capacitor is disconnected from the battery and the plateseparation is increased. What happens to the potential difference between the plates?

A The potential difference between the plates increases.

B More information is needed to answer this question.

C The potential difference between the plates decreases.

D The potential difference between the plates stays the same.