Jeffrey Piggott
Quiz by , created more than 1 year ago

A Level Quiz on Charging and Discharging a Capacitor.

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Jeffrey Piggott
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Charging and Discharging a Capacitor

Question 1 of 4

1

Which of the following sequences explains how to charge an electroscope by induction using a plastic rod that has been rubbed with fur?

Select one of the following:

  • Touch plastic rod to metal sphere on the top of the electroscope, then remove it.

  • Touch metal sphere of electroscope with finger to ground it. Bring charged plastic rod near metal sphere without touching it. Remove rod then remove finger.

  • Bring charged plastic rod near the metal sphere of electroscope without touching it. Briefly touch the sphere with finger to ground it. Remove finger, then remove charged rod.

  • Touch metal sphere of electroscope with finger to ground it. Touch charged plastic rod to metal sphere of electroscope. Remove both at same time.

Explanation

Question 2 of 4

1

The two plates of a parallel plate capacitor in a circuit have a charge that is equal in magnitude but opposite sign in sign because:

Select one of the following:

  • One plate becomes negatively charged from the battery. The other plate polarizes, driving negative charge away from that plate.

  • Current flows through both plates. After electrons are used up moving through the 1st plate, the 2nd plate is left positive.

  • Electrons from the battery are stopped by one plate, giving the plate a positive charge. The other plate polarizes to be negative.

  • Electron current flows one way out of the battery, setting up a negative charge on one plate. Proton current flows out the other end of the battery setting up a positive charge on the other plate.

Explanation

Question 3 of 4

1

A capacitor is placed in a circuit and allowed to charge.
After a long time, why does the current stop flowing in the circuit? (Select 2 answers)

Select one or more of the following:

  • Electric potential across the capacitor acts like a battery in the opposite direction.

  • Electrons discharge out of the circuit.

  • Current becomes slower as protons are stored on the capacitor plates.

  • Negative charges on the capacitor repel the electron current from the battery.

Explanation

Question 4 of 4

1

A student builds two series circuits. The relative values of capacitance (C), resistance (R) and battery potential (V) of the two circuits is listed below:
Circuit 1: Capacitor C, Resistor R, Battery V.
Circuit 2: Capacitor 2C, Resistor R/2, Battery 2V.

Which of the following statements is true? (Select 2 answers)

Select one or more of the following:

  • The capacitor in Circuit 1 will charge faster than the capacitor in Circuit 2.

  • The capacitors in both circuits will charge in the same amount of time.

  • The capacitors in both circuits will reach the same maximum potential difference.

  • The capacitor in Circuit 2 will reach a higher maximum potential difference.

Explanation

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