Electric Charges & Fields: Gauss's Law
Which of the following describes the primary difference between charging by contact and charging by induction?
Charging by contact requires grounding, while charging by induction does not.
Charging by contact results in the opposite charge, while charging by induction results in the same charge.
Charging by contact involves direct transfer of charge, while charging by induction involves redistribution of charge.
Charging by contact only works for insulators, while charging by induction only works for conductors.
Two identical metal spheres, A and B, are initially neutral. Sphere A is given a charge of +4Q. Sphere A is then brought into contact with sphere B and separated. What is the final charge on each sphere?
A: +4Q, B: 0
A: +2Q, B: +2Q
A: +Q, B: +3Q
A: 0, B: +4Q
Which of the following statements is true regarding electric charge?
Only positive charges can move.
Electric charge is quantized.
Electric charge is not conserved.
Electrons have a positive charge.
Which method of charging involves the transfer of electrons through rubbing two neutral objects together?
Conduction
Induction
Friction
Polarization
A charged rod is brought near a neutral piece of paper. The paper is attracted to the rod. Which of the following explains this phenomenon?
The paper becomes charged by contact.
The paper becomes charged by induction.
The charged rod polarizes the paper.
The paper and the rod have the same charge.
An object has a net charge of C. How many excess electrons does it have?
50
200
500
20
A positively charged rod is used to charge a neutral metal sphere by contact. What will be the charge of the metal sphere after the rod is removed?
Positive
Negative
Neutral
It depends on the magnitude of the charge on the rod.

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What happens when a charged metal sphere is connected to the ground?
The sphere becomes more charged.
The sphere retains its charge.
The sphere becomes neutral.
The sphere's charge doubles.
A negatively charged metal sphere is grounded. In which direction do the electrons flow?
From the ground to the sphere
From the sphere to the ground
Electrons do not flow
Protons flow from the sphere to the ground
A negatively charged rod is brought near, but not touching, a neutral conducting sphere. The sphere is then grounded while the rod is nearby. What is the final charge on the sphere after the ground connection is removed and then the rod is ...
Positive
Negative
Neutral
Impossible to determine