In a cylinder provided with a piston, air is under pressure $P_1$ at a constant temperature ' $t$ '. A soap…

In a cylinder provided with a piston, air is under pressure $P_1$ at a constant temperature ' $t$ '. A soap bubble with radius ' $r$ ' and surface tension ' $\mathrm{T}$ ' is lying inside the cylinder. To reduce the radius of the soap bubble to half, the required air pressure inside the cylinder is
  1. $8 \mathrm{P}_1+\frac{24 \mathrm{~T}}{\mathrm{r}}$
  2. $8 \mathrm{P}_1+\frac{3 \mathrm{~T}}{\mathrm{r}}$
  3. $8 \mathrm{P}_1+\frac{2 \mathrm{~T}}{\mathrm{r}}$
  4. $8 \mathrm{P}_1+\frac{12 \mathrm{~T}}{\mathrm{r}}$

Solution

No solution. Refer to answer key.

Asked in: AP EAMCET 2017 (25 Apr Shift 2)

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