Question

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Why do we say that only repulsion is a sure test of charge on a body ?

Answer 1

Because when we bring a charged body near an uncharged body an opposite charge is induced on the neutral body. And their will an attraction between them. But the given body is uncharged.

Therefore, repulsion is a sure test of charge.

Answer 2

$<b> ǫᴜᴇsᴛɪᴏɴ– Why do we say that only repulsion is a sure test of charge on a body ?$

ᴀɴsᴡᴇʀ–

$<b><i> Attraction by A charged body does not indicate whether the body is also charged or not. However, if the body being tested is repelled by the charged body, it is certain that the body is charged. It has the same charge as on the charged body. So, Repulsion is a sure test of charge on a body.$