9642849
Description
Quiz by Jeffrey Piggott, updated more than 1 year ago
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Created by Jeffrey Piggott
almost 7 years ago
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Question 1
Question
Which of the following sequences explains how to charge an electroscope by induction using a plastic rod that has been rubbed with fur?
Answer
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Touch plastic rod to metal sphere on the top of the electroscope, then remove it.
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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.
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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.
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Touch metal sphere of electroscope with finger to ground it. Touch charged plastic rod to metal sphere of electroscope. Remove both at same time.
Question 2
Question
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:
Answer
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One plate becomes negatively charged from the battery. The other plate polarizes, driving negative charge away from that plate.
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Current flows through both plates. After electrons are used up moving through the 1st plate, the 2nd plate is left positive.
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Electrons from the battery are stopped by one plate, giving the plate a positive charge. The other plate polarizes to be negative.
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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.
Question 3
Question
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)
Answer
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Electric potential across the capacitor acts like a battery in the opposite direction.
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Electrons discharge out of the circuit.
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Current becomes slower as protons are stored on the capacitor plates.
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Negative charges on the capacitor repel the electron current from the battery.
Question 4
Question
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)
Answer
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The capacitor in Circuit 1 will charge faster than the capacitor in Circuit 2.
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The capacitors in both circuits will charge in the same amount of time.
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The capacitors in both circuits will reach the same maximum potential difference.
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The capacitor in Circuit 2 will reach a higher maximum potential difference.
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