A thin metallic spherical shell contains a charge Q on its surface. A point charge q₁ is placed at the centre of the shell and another charge q₂ is placed outside the shell. All the three charges are positive. Then, the force on charge q₁ is

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zero

none of these

towards left

towards right

answer is C.

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Detailed Solution

Due to Electrostatic shielding, the metallic spherical shell acts as a shield and do not allow the electric field due to outside charges to penetrate through it. Hence, electric field inside shell due to Q and q₂ is zero.
Therefore, no force will act on charge q₁.

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