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MHT CET 2021 (20 Sep, Shift 1) · Excess Pressure: Drops & Bubbles

Excess Pressure: Drops & Bubbles question from MHT CET 2021 (20 Sep, Shift 1)

Q45MHT CET 2021 · 20 SEP · SHIFT 1Easy

Excess Pressure: Drops & Bubbles

Air is pushed in a soap bubble to increase its radius from 'R' to '2R'. In this case, the pressure inside the bubble

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Answer: (b)

Pressure inside $= P_0 + \frac{4T}{R}$ ; the excess part varies as $\frac{1}{R}$ .
When $R \to 2R$ , the excess pressure becomes half, so the inside pressure falls.
So the answer is (b) decreases.

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