Chapter 22- Electrostatics (Homework)

Two charged particles held close to each other are released. As they move, the force on each particle increases. Therefore, the particles have: A. The opposite sign. B. The same sign. C. Not enough information is given.

A. The opposite sign.

The primary purpose of a lightening rod is to: A. Induce within the structure to which it attached a charge opposite to that of charged clouds overhead. B. Discharge the structure to which it is attached. C. Cancel the electric field within the structure to which it is attached. D. Attract lightning and guide it to the ground.

B. Discharge the structure to which it is attached.

Rub electrons from your hair with a comb and the comb becomes: A. Positively charged. B. Negatively charged.

B. Negatively charged.

A positive ion has more: A. Electrons than protons B. Protons than electrons C. Protons than neutrons D. Neutrons than protons

B. Protons than electrons

A balloon will stick to a wooden wall if the balloon is charged: A. Negatively B. Positively C. Either D. Neither

C. Either

Particle A and B interact with each other. Particle A has twice the charge of particle B. Compared to the force on particle A, the force on Particle B is: A. Two times as much. B. None of these. C. Half as much. D. The same. E. Four times as much.

D. The same

A main difference between gravitational and electrical forces is that electrical forces: A. Are weaker B. Attract C. Act over shorter distances. D. Obey the inverse-square laws E. Repel and attract.

E. Repel and attract.