When a soap bubble is charged :-

Options

A. it contracts
B. it expands
C. its size remains the same
D. it expands or contracts depending upon whether the charge is positive or negative

Answer

B

Explanation

For an unelectrified soap bubble force due to excess pressure from inside is balanced by the force due to surface tension. When it is given an electric charge, there is an outward normal force (`sigma^(2)//2epsilon_(0)` per unit area, where `sigma` is the surface charge density) that expands the bubble.