To test if a body is charged or not, we will use

Subtonic: Types of Charges and Their Interaction

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Another uncharged body

A positively charged body

A negatively charged body

A positively and negatively charged body

answer is D.

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Detailed Solution

To test if a body is charged or not, we will use a positively and negatively charged body.
We will bring an uncharged body close to positively and negatively charged bodies to see if it is charged or not. An uncharged body is attracted to both positively and negatively charged bodies. A charged body always creates charge polarisation on a neutral body, so the second body appears to be charged and is attracted to the first.

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