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Question

# 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

A
Towards right
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B
Towards left
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C
Zero
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D
None of these
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Solution

## The correct option is C Zero Force on charge will depend on the electric field intensity at that place. Considering a spherical Gaussian surface inside the shell. Here qenclosed=0 because +q1 is a test charge and +q2 and +Q are outside the Gaussian surface. ∴E=0 Thus, the force experienced by charge +q1 at centre of shell is zero. Also since q1 lies inside the conductor, it is always shielded from outside charges(q2) and electric field. This process is also known as electrostatic shielding. So, (c) is the correct choice.

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