What will be the change in the radius of a
soap bubble if it is given positive charge?
Select one
The radius will decrease
The radius will increase
The radius may increase or decrease
The radius will remain unchanged
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Answer:
By symmetry, the charge will distribute evenly over the surface of the bubble. Because like charges repel, they want to move even further apart, the only which way is outward, taking the soap surface with them. Of course, the increase in restoring force of the soap film (surface tension) will at some point be equal and opposite to the electrostatic force, resulting in a new (larger) equilibrium radius.
This will happen to both positive and negatively charged bubbles because of the ionic similarity.
Hence, when the soap bubble is given a negative charge, then its radius will increase.
Explanation:
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