Two spherical soap bubbles of a radii $r_{1}$ and $r_{2}$ in vacuum coalesce under isothermal conditions. The resulting bubble has the radius $R$ such that

R = r_{1} + r_{2}

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R^{2} = r_{1}^{2} + r_{2}^{2}

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R = \frac{r_{1} + r_{2}}{r_{2}}

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none of these

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Solution

The correct option is B $R^{2} = r_{1}^{2} + r_{2}^{2}$

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