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Q.

A thin metallic spherical shell contains a charge Q on it. A point charge q is placed at the centre of the shell and another charge q1 is placed outside it as shown in figure. All the three charges are positive.

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The force on the charge at the centre is

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a

zero

b

upward

c

towards left

d

towards right

answer is D.

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Detailed Solution

Note that there is no field inside the metallic shell and hence no force is experienced by the charge at the centre.

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