On charging a soap bubble, its radius increases. This is because

because the charges on the surface of the bubble attract each other.

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because the pressure outside drops

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because the charges on the surface of the bubble repel each other.

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None of the above.

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Solution

The correct option is D because the charges on the surface of the bubble repel each other.
The bubble will expand because the charged particles uniformly distributed on it causes them to repel each other due to the electrostatic force. This will happen to both positive and negatively charged bubbles because of the charge on it.

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