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

Question

A soap bubble is given negative charge. Then its radius: (A) decreases (B) increases (C) remains unchanged (D) nothing can be said because sufficient information is not available

Tardigrade Admin · Accepted Answer

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.

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

decreases

increases

remains unchanged

nothing can be said because sufficient information is not available

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.