A spherical shell of radius r carries a uniformly distributed surface charge q on it. A hemispherical shell of radius R(gt r) is placed covering it with its centre coinciding with that of the sphere of radius r. The hemisphere has a uniform surface charge Q on it. The charge distribution on the sphere and the hemisphere is not affected due to each other. Calculate the force that the sphere will exert on the hemisphere.

A spherical shell of radius r carries a uniformly distributed surface

1.	A spherical shell of radius r carries a uniformly distributed surface charge q on it. A hemispherical shell of radius R(gt r) is placed covering it with its centre coinciding with that of the sphere of radius r. The hemisphere has a uniform surface charge Q on it. The charge distribution on the sphere and the hemisphere is not affected due to each other. Calculate the force that the sphere will exert on the hemisphere.
Answer» Correct Answer - `(Qq)/(4piepsilon_(0)R^(2))(1-(1)/(sqrt(2)))`

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