Test I Review

Doug rubs a piece of fur on a hard rubber rod, giving the rod a negative charge. What happens?

• Protons are removed from the rod.

• Electrons are added to the rod.

• The fur is also charged negatively.

• The fur is left neutral.

A repelling force must occur between two charged objects under what conditions?

• Charges are of unlike signs.

• Charges are of like signs.

• Charges are of equal magnitude.

• Charges are of unequal magnitude.

When a glass rod is rubbed with silk, which of the following statements best describes what happens?

• Electrons are removed from the rod.

• Protons are removed from the silk.

• The silk is charged positively.

• The silk remains neutral.

Who was the first to determine the electrons charge?

• Franklin

• Coulomb

• Millikan

• Faraday

Which of the following best characterizes electrical conductors?

• a low mass density

• high tensile strength

• electric charges move freely

• poor heat conductors

Two small objects are suspended from threads. When the objects are moved close together, they attract one another. Which of the following could produce this result?

• One object is positively charged and the other is negatively charged.

• One object is positively charged and the other is uncharged.

• One object is negatively charged and the other is uncharged.

• All of the above could result in such an attraction.

If a negative charge is placed inside a hollow isolated conductor that is originally neutral and the charge does not touch that conductor at any time:

• both the inner and outer surfaces will become negative.

• both the inner and outer surfaces will remain neutral.

• the outside surface of the conductor will become positively charged.

• the inside surface of the conductor will become positively charged.

Object A has a charge q on it, object B has a charge q on it, and object C has a charge 3q on it. These charges are arranged, one each, at the verticies of an equilateral triangle. Which charge has the greatest magnitude of electrical force on it.

• A

• B

• C

• All have equal magnitude forces on them.

• A and B

The combination of two separated point charges of opposite sign but equal magnitude is called an electric:

• monopole

• dipole

• quadrapole

• magnapole

The Milikan Oil Drop experiment demonstrated that

• small oil drops fall slowly through the air

• light beams can be used to illuminate small oi droplets

• the electronic charge is quantized

• falling oil droplets reach terminal speed