Electrostatic Charging Quiz

The hinged conductor moves away from the fixed conductor if a charge is applied to the electroscope, because

• like charges repel each other.

• like charges attract each other.

• unlike charges attract each other.

• unlike charges repel each other.

Two lightweight metal spheres are suspended near each other from insulating threads. One sphere has a net charge; the other sphere has no net charge. The spheres will;

• attract each other.

• exert no net electrostatic force on each other.

• repel each other.

• do any of these things depending on the sign of the net charge on the one sphere.

A metal plate is connected by a conductor to a ground through a switch. The switch is initially closed. A charge +Q is brought close to the plate without touching it, and then the switch is opened. After the switch is opened, the charge +Q is removed. What is the charge on the plate then?

• The plate is uncharged.

• The plate is positively charged.

• The plate is negatively charged.

• The plate could be either positively or negatively charged.

You bring a negatively charged rubber rod close to an grounded conductor without touching it. Then you disconnect the ground. What is the sign of the charge on the conductor after you remove the charged rod?

• negative

• positive

• no charge

• cannot be determined from the information given

The figure shows charging by;

• Triboelectric

• Grounding

• Induction

• Contact