Question:
A soap bubble is given a negative charge. The pressure inside the bubble:
A soap bubble is given a negative charge. The pressure inside the bubble:
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Remember that increasing the radius of a soap bubble causes the pressure inside it to decrease due to the formula involving surface tension.
Updated On: May 5, 2026
- increases
- becomes equal to atmospheric pressure
- does not change
- decreases
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The Correct Option is D
Solution and Explanation
- When a soap bubble is charged, like charges spread over its surface and repel each other.
- This electrostatic repulsion tends to expand the bubble, increasing its radius.
- Pressure inside a soap bubble is given by: \[ P = \frac{4T}{r} \]
- As the radius \(r\) increases, the pressure \(P\) decreases since \(P \propto \frac{1}{r}\).
- Hence, due to charging, the bubble expands and its internal pressure decreases.
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