Physics Chapter 18-19 Review

Who was/were among the first to experiment extensively on electrification?

• the Greeks
• Charles Du Fay
• William Gilbert
• Benjamin Franklin

Benjamin Franklin and Charles DuFay assumed electricity to be

• an electrical fluid.
• a solid or liquid.
• discontinuous.
• a flow of negative charge.

The scientist who discovered the electron was

• Robert Millikan.
• Benjamin Franklin.
• J. J. Thomson.
• William Gilbert.

The charge-to-mass ratio of the electron was demonstrated by

• Robert Boyle
• J. J. Thomson.
• Charles DuFay.
• Robert Millikan.

The scientist who probably coined the name electron was

• George Stoney.
• Wilhelm Wien.
• Robert Millikan.
• Eugen Goldstein.

What substance was used to measure the fundamental charge?

• acetone
• perfume
• water
• oil

The scientist who discovered the charge of an electron was

• Benjamin Franklin
• Robert Millikan.
• William Gilbert.
• J. J. Thomson.

Robert Millikan's oil drop experiment

• did not actually measure the charge of an individual electron.
• established the fact that every electron carries a charge of the same magnitude.
• always resulted in drops which were positively charged.
• yielded results showing that the charge was not always in discrete values.

Robert Millikan’s oil-drop experiment

• measured the charge of a proton
• yielded results showing that the charge was continuous.
• established the fact that every electron carries a charge of the same magnitude.
• always resulted in drops which were positively charged.

Both vitreous and resinous electricks are types of

• insulators.
• semi-insulators.
• semi-conductors.
• conductors.