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  4. A soap bubble is given negative charge. Then its radius:

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Q. A soap bubble is given negative charge. Then its radius:

Jharkhand CECEJharkhand CECE 2002

Solution:

A soap bubble has two surfaces. When it is given negative charge, it spreads over two surfaces i.e., its two surfaces become negatively charged. Also as we know that same charges repel, so two surfaces of bubble repel each other. Hence, its radius increases.