The basic law of Electrostatics,
Like charges repel one another while unlike charges attract one another.
The positive test charge is strongly attracted by A, meaning that A is negatively charged.
Consider three plastic balls (A, B, and C), each carrying a uniformly distributed charge equal to either +Q, -Q or zero, and an uncharged (neutral) copper ball (D). A positive test charge (T) experiences the forces shown in the figure when brought very near to the individual balls. The test charge T is strongly attracted to A, strongly repelled from B, weakly attracted to C, and strongly attracted to D.
What is the nature of the force between balls A and B?
a) strongly attractive
b) strongly repulsive
c) weakly attractive
d) neither attractive nor repulsive
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