Electricity and Magnetism Quiz UNIT 9 AP PHYSICS

The direction of electric field lines shows the:

• direction of the force on a positive test charge

• size of the field

• strength of the field

• all the above

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Why does your hair stand on end when touching the Van de Graaff generator?

• hair strands are at a high voltage

• strong electric fields

• like charges repel

• hair is a good conductor

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Why does a balloon stick to a wall after you rub it in your hair?

• the balloon is neutral and so is the wall

• The negative balloon attracts the negative electron clouds

• The negative balloon repels the electron clouds

• The wall is just sticky

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What happens to the gravitational and electric force if you triple the distance of separation?

• 3

• 9

• 1/3

• 1/9

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One difference between Electrical Forces and Gravitational Forces is that electrical forces include:

• infinite range

• repulsive interactions

• inverse square law

• none of the above

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When a capacitor discharges:

• It must be attached to a battery

• Charges move back to their original position until plates are oppositely charged

• Protons and Electrons on plates switch places until neutral

• It cannot ever be discharged

When you bring a negative rod to a conductor and quickly touch the back side with your finger:

• the conductor becomes positive

• the conductor becomes negative

• the charge is the same

• the conductor is neutral

How does a balloon stick to a neutral wall?

• grounding

• conduction

• polarization

• contact

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The electric force between two objects is 8e-5 N. If you double the distance the force becomes… F=?

• 16e-5 N

• 2e-5 N

• 64e-5 N

• 4e-5 N

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How does a rod become positively charged if only electrons can move?

• Protons are removed or added

• Electrons are added

• Electrons are taken off the rod

• Everything must always be neutral in nature