79. A test charge means a charge of
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Explanation:
test charge is a point charge which does not affect source charge but it is used to describe effects of charges
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test charge is point charge which has so much less magnitudes that it will not affect other charges present in charges system (this type of chargers are used in the derivations for finding potential at a point due to a charge because test charge need to have so less magnitude such that it will not cause motion in the other charge )
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