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# 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 isTowards leftTowards rightUpwardZero

A
Towards left
B
Towards right
C
Zero
D
Upward
Solution
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#### Step 1: Electrostatic ShieldingDue 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 q1 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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