Electrostatics Review

A positive rod touches a metal sphere. This is charging by

• conduction

• induction

• friction

• polarization

A negative rod is brought near a metal sphere and then removed. This is charging by _____ and is ________

• conduction, permanent

• induction, permanent

• conduction, temporary

• induction, temporary

Shuffling your feet across the carpet to collect electrons is charging by

• friction

• conduction

• induction

• polarization

If a charging rod is made out of an insulating material that attracts electrons, what is true about the electron transfer?

• Electrons will leave the rod, even though it attracts electrons, because it is an insulator.

• Electrons will move to the rod and through the rod the person's hand.

• Electrons will move to the rod and stay on the end of the rod, they will not move to the person's hand.

• Protons will leave the rod since it is an insulator.

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Electrons are added to a conducting sphere that is on an insulating stand. What happens next?

• Electrons stay in the location where they were added.

• Electrons repel each other and move freely to spread out on the metal.

• Electrons attract each other and clump up on the top of the sphere.

• Electrons will move through the sphere and the insulating stand to the ground.

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The only way to make induction a permanent transfer of charge is to ______ the charged object.

• insulate

• ground

• polarize

• energize

A neutral object will be attracted to a charged object. This is due to __________.

• neutralization

• induction

• grounding

• polarization

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Two positively charged styrofoam balls will

• repel

• attract

• not exert forces on each other

• polarize each other

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When you brush your hair you scrape off electrons, and your hair

• becomes positively charged
• becomes negatively charged
• becomes positively and negatively charged
• remains uncharged, or neutral

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As a pair of charges is brought close together, the force between them

• Increases
• Decreases
• Increases only if they are the same sign
• Increases only if they are the opposite sign

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