Electrostatics Conceptual Practice

A neutron will ___ a proton.

• attract

• repel

• not affect

A nonpolar neutral molecule will ___ an electron

• be attracted by

• be repelled by

• be unaffected by

An electron will ____ a proton.

• attract

• repel

• not affect

A lithium ion (Li⁺¹) will ____ a proton

• attract

• repel

• not affect

A balloon (made of neutral polar molecules) will ____ a negatively charged rod.

• be attracted by

• be repelled by

• be unaffected by

When you rub a balloon on your hair, you are charging both hair and balloon by ____.

• contact

• friction

• induction

• convection

When charge builds up before a lightning strike, it creates an opposite charge in the objects close to it (trees, poles, etc.). This is an example of charging by ____.

• contact

• friction

• induction

• radiation

In a laboratory, a metal rod is charged up so that it has +0.8 C on it. It touches a sphere with a charge of -1.5 C. After contact, the sphere has a charge of -0.3 C. What is the charge on the rod after contact?

• -0.7 C

• -0.3 C

• -0.4 C

• +0.3 C

Which law of physics do you use to conclude that the total charge remains the same before and after objects are charged by friction or contact?

• Law of Conservation of Charge

• Law of Conservation of Energy

• Basic Law of Electrostatics

• Newton's 2nd Law of Motion

In which way(s) of charging do objects end up with charges of opposite sign?

• contact only

• friction only

• induction only

• contact and friction

• induction and friction