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

Electrical appliances in homes are normally earthed in that _________ (JAMB 2004)

A. both a.c. and d.c. sources can be used
B. a person touching appliances ¡s safe from electric shock
C. the appliances are maintained at a higher p.d. than the earth
D. the appliances are maintained at a lower p.d. than the earth

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.

A negatively charged rod is held close to an uncharged metal ball on an insulating stand. The ball will ______ (WASSCE 2008)

A. be negatively charged
B. be positively charged
C. have an excess of negative charges on the side nearest the rod.
D. have an excess of positive charges on the side nearest the rod.

The electric field between two-point charges is shown in the diagram above. What types of charges are at X and Y? (JAMB 2002)

A. Both X and Y are negative
B. Both X and Y are positive
C. X is positive and Y is negative
D. X is negative and Y is positive

If negative charges are induce on an electroscope and a positively charged rod is brought near the cap of the electroscope, the leaves will _____ (JAMB 2009)

A. close up   
B. become positively charged
C. become negatively charged
D. open further