A hollow sphere has a small hole in it. On lowering the sphere in a tank of water, it is observe...

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A hollow sphere has a small hole in it. On lowering the sphere in a tank of water, it is observed that water enters into the hollow sphere at a depth of \( 40 \mathrm{~cm} \) below the surface.
\( \mathrm{P} \) Surface tension of water is \( 7 \times 10^{-2} \mathrm{~N} / \mathrm{m} \). The diameter of

W the hole is
(1) \( \frac{1}{28} \mathrm{~mm} \)
(2) \( \frac{1}{21} \mathrm{~mm} \)
(3) \( \frac{1}{14} \mathrm{~mm} \)
(4) \( \frac{1}{7} \mathrm{~mm} \)
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