Electric Charges & Fields: Gauss's Law
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.
An object has a net charge of C. How many excess electrons does it have?
50
200
500
20
Which method of charging involves the transfer of electrons through rubbing two neutral objects together?
Conduction
Induction
Friction
Polarization
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.
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 removed?
Positive
Negative
Neutral
Impossible to determine
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.
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.

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Why does a charged object attract a neutral object?
The neutral object gains a net charge from the charged object.
The charged object repels electrons in the neutral object.
The charged object induces charge separation in the neutral object.
The neutral object always has an opposite charge to the charged object.
What fundamental principle states that the total electric charge in an isolated system remains constant?
Coulomb's Law
Ohm's Law
Conservation of Energy
Conservation of Charge
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