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In Guericke's experiment to show the effect of atmospheric pressure, two copper hemispheres were tightly fitted to each other to fom a hollow sphere and the air from the sphere was pumped out to create vacuum inside. If the radius of each hemisphere is $R$ and the atmospheric pressure is $P$, then the minimum force required (when the two hemispheres are pulled apart by the same force) to separate the hemispheres is
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The correct answer is:
$\pi R^{2} P$
$F=\left(P_{0}-0\right) A$
$F=\pi R^{2} P$
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