In the given picture the Ring A at the bottom is positively charged. Another Ring B is brought and placed over it. Ring B hovers at a certain height above A. What could be the charge on Ring B?

Positive

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Negative

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Neutral

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Can’t say

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Solution

The correct option is A
Positive

If the rings weren't charged , Ring A would fall right?

But being charged is sort of repelling them away.
so what kind of charges repel? Similar charges.
If ring A is positively charged, B must be positively charged!!

Can it be neutral??
Nope.
Because it is a metal, ring A would attract the negative charge on the bottom side of ring B. Instead of repelling they would attract even more!

Correct answer is 'Positive'

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