Physics Review Part 4: Electricity

1. The charge of an electron is

• positive.

• negative.

• Electrons have no charge.

Atomic nuclei of almost all elements consist of

• only neutrons.

• protons and electrons.

• neutrons and electrons.

• only protons.

• protons and neutrons.

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Two like charges

• neutralize each other.

• repel each other.

• must be neutrons.

• attract each other.

• have no effect on each other.

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4. Protons and electrons

• A. attract each other.

• B. repel each other.

• C. do not interact.

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Two charges are separated by a certain distance. If the magnitude of one of the charges is doubled, the force is ____.

• halved.

• doubled.

• tripled.

• quadrupled.

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When the distance between two charges is doubled, the electrical force between the charges

• doubles.

• reduces to one fourth.

• halves.

• quadruples.

• reduces to one sixteenth.

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In order for an atom to become negatively charged, it must _____ .

• lose electrons

• gain electrons

• remain neutral

• lose protons

A difference between electrical forces and gravitational forces is that electrical forces ____

• use Newtons as units.

• have both attractive and repulsive interactions.

• change inversely with the square of the distance between charged objects.

• are vector quantities.

• are measured in C.

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In a good ______, electrons are usually ______ to move around than in a good conductor.

• insulator, more free

• conductor, more free

• conductor, less free

• insulator, less free

• insulator, just as free

A conductor differs from an insulator in that a conductor has

• electrons that move less freely.

• faster-moving molecules.

• more electrons than protons.

• more electrons than an insulator.

• electrons that move more freely.

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