When a soap water bubble is given a positive charge it expands. If it is given a negative charge, then it

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expands

contracts

remains same

does not hold negative charge

answer is A.

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Detailed Solution

Due to the uniform distribution of charged particles on it, which causes them to reject one another due to the electrostatic force, the bubble will grow.
Due to the charge on it, this will occur to both positively and negatively charged bubbles.

Hence the bubble expands whenever a charge is given to it, irrespective of the sign.

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