First slide

Electrostatic force

Question

An electric charge q exerts a force F on a similar electric charge q separated by a distance r. A third charge q/4 is placed midway between the two charges. Now, the force F will

Moderate

A

become F/3
B

become F/9
C

become F/27
D

remain F

Solution

Force between two charges does not depend upon the presence or absence of third charge.

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