A thin metallic spherical shell contains a charge $Q$ on its surface. A point charge $q_{1}$ is placed at the centre of the shell and another charge $q_{2}$ is placed outside the shell. All the three charges are positive. Then, the force on charge $q_{1}$ is

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Answer 1

$Step 1: Electrostatic Shielding$
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 $q_{1}$ is zero.
Therefore, no force will act on charge $q$ .

Hence, Correct answer is $(D)$

$Note :$ Electrostatic shielding acts in case of closed metallic surfaces with cavity in which external field does not effect internal contents and internal field does not effect external contents.

Answer 2

Step 1: Electrostatic Shielding

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

q_{1}

is zero.

Therefore, no force will act on charge

q

.

Hence, Correct answer is

(D)

Note :

Electrostatic shielding acts in case of closed metallic surfaces with cavity in which external field does not effect internal contents and internal field does not effect external contents.

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