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 would be the charge on ring B.

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Positive

Negative

Neutral

None of these

answer is A.

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Detailed Solution

Concept: There are three ways to transfer charge: by friction, conduction, and induction. Here, the method of transferring charge without making contact between the charged and neutral bodies is applied.
Friction-based charge transfer involves rubbing two uncharged bodies together. When they rub against one another, both bodies pick up opposing charges.
Charge transfer by conduction: When a charged body touches a conductive object that is not charged, the same charge moves from the charged object to the charged object. As a result, this process involves the transfer of charge upon physical contact between two bodies.
Charge transfer by induction: In this technique, a charged body is approached without being touched by an uncharged body. The uncharged body picks up a charge that is the opposite of the charged body's.
It is stated in the question that the lowest ring, A, is positively charged and that ring B hovers at a specific height above A. Due to the fact that ring A is charged and ring B is located apart from it, charge transfer by induction will occur, causing ring B to become negatively charged in contrast to ring A.
Hence, option 1 is the correct answer.

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