KVPY SA Exam 05-Nov-2017 Question Paper

Question : 20 of 80

Marks: +1, -0

In Guericke’s experiment to show the effect of atmospheric pressure, two copper hemispheres were tightly fitted to each other to form 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

$2πR^2P$
4πR^2P
$πR^2P$
$πR^2P\/2$

Validate

Solution:

F = (P_0 -0)A

F = πR^2P

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