Physics Practice Test – Electric Charges (Questions with Answers and Explanations)

A positively charged rod X is brought near an uncharged metal sphere Y and is then touched by a finger with X still in place. When the finger is removed, the result is that Y has _______ (JAMB 2003)

A. on charge and a zero potential
B. a positive charge and a zero potential
C. a negative charge and a positive potential
D. a negative charge and a negative potential

Charges on a conductor are _______ (WASSCE 2004)

A. evenly distributed over a surface of any shape
B. concentrated on the inner surface of the conductor
C. concentrated at the outer flat surface of the conductor
D. generally concentrated at sharply curved surface.

Which of the figures below shows the correct distribution of charges on an isolated positively charged hollow metal?

If an ebonite rod is rubbed with fur, it is true that ______ (JAMB 2020)

A. the fur will acquire positive charges while the rod will acquire negative charges
B. the fur will acquire negative charges while the rod wilt acquire positive charges
C. both the fur and the rod will acquire positive charges
D. both the fur and the rod will acquire negative charges

A positively charged glass rod is placed near the cap of a positively charged electroscope. The divergence of the leaf is observed to ___ (WASSCE 2010)

A. decreases
B. increases
C. remain the same
D. increase and collapse immediately.