Physics 100B - General Physics II » Spring 2022 » Pre-Class 7

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Question #1
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 remains constant.
C.   The energy stored in the capacitor doubles its original value.
D.   The energy stored in the capacitor is decreased to one-half of its original value.
E.   The energy stored in the capacitor is decreased to one-fourth of its original value.
Question #2
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 energystored in the capacitor affected?
A.   The energy stored in the capacitor is decreased to one-half of its original value.
B.   The energy stored in the capacitor doubles its original value.
C.   The energy stored in the capacitor quadruples its original value.
D.   The energy stored in the capacitor remains constant.
E.   The energy stored in the capacitor is decreased to one-fourth of its original value.
Question #3
Consider two capacitors with unequal capacitance connected in series to a battery. Which of the following statements are true?
A.   The equivalent capacitance of the combination of the two capacitors is less than the capacitance of either of the capacitors. The charge stored on each of the capacitors is the same. The algebraic sum of the voltages across the two capacitors is equal to the voltage supplied by the battery.
B.   The charge stored on each of the capacitors is the same. The voltage across each of the capacitors is the same. The equivalent capacitance of the combination of the two capacitors is greater than the capacitance of either of the capacitors.
C.   The sum of the charges stored on each capacitor is equal to the charge supplied by the battery. The voltage across each of the capacitors is the same. The equivalent capacitance of the combination of the two capacitors is greater than the capacitance of either of the capacitors.
D.   The sum of the charges stored on each capacitor is equal to the charge supplied by the battery. The voltage across each of the capacitors is the same.The algebraic sum of the voltages across the two capacitors is equal to the voltage supplied by the battery.
Question #4
Consider two capacitors with unequal capacitance connected in parallel to a battery. Which of the following statements are true?
A.   The sum of the charge stored on each capacitor is equal to the charge supplied by the battery. The equivalent capacitance of the combination is greater than the capacitance of either of the capacitors. The voltage across each of the capacitors is the same.
B.   The charge stored on each of the capacitors is the same. The equivalent capacitance of the combination is less than the capacitance of either of the capacitors. The sum of the charge stored on each capacitor is equal to the charge supplied by the battery.
C.   The voltage across each of the capacitors is the same. The equivalent capacitance of the combination is less than the capacitance of either of the capacitors. The algebraic sum of the voltages across the two capacitors is equal to the voltage supplied by the battery.
D.   The charge stored on each of the capacitors is the same. The equivalent capacitance of the combination is less than the capacitance of either of the capacitors. The algebraic sum of the voltages across the two capacitors is equal to the voltage supplied by the battery.
Question #5
A resistor, capacitor, and switch are all connected in series to an ideal battery of constant terminal voltage. Initially, the switch is open and the capacitor is uncharged. What is the voltage across the resistor and the capacitor at the moment the switch is closed?
A.   The voltage across both the resistor and the capacitor is equal to the terminal voltage of the battery.
B.   The voltage across the resistor is zero, and the voltage across the capacitor is equal to the terminal voltage of the battery.
C.   The voltage across both the resistor and the capacitor is zero.
D.   The voltage across the resistor is equal to the terminal voltage of the battery, and the voltage across the capacitor is zero.
E.   The voltage across both the resistor and the capacitor is equal to one-half of the terminal voltage of the battery.
Question #6
A resistor and a capacitor are connected in series to an ideal battery of constant terminal voltage. When the system reaches its steady state, what is the voltage across the resistor and the capacitor?
A.   The voltage across the resistor is zero, and the voltage across the capacitor is equal to the terminal voltage of the battery.
B.   The voltage across both the resistor and the capacitor is equal to the terminal voltage of the battery.
C.   The voltage across both the resistor and the capacitor is zero.
D.   The voltage across both the resistor and the capacitor is equal to one-half of the terminal voltage of the battery.
E.   The voltage across the resistor is equal to the terminal voltage of the battery, and the voltage across the capacitor is zero.

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