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Question

Charges Q1 and Q2 are placed inside and outside respectively of an uncharged conducting shell. Their seperation is r.

A
The force on Q1 is zero.
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B
The force on Q1 is kQ1Q2r2
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C
The force on Q2 is kQ1Q2r2
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D
The force on Q2 is zero.
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Solution

The correct options are
A The force on Q1 is zero.
C The force on Q2 is kQ1Q2r2
As the electric field inside the conducting shell is zero , so the force on the inner charge, Q1 will be zero.
The electric field at outside charge Q2 due to Q1 is E=kQ1r2
Force on Q2 is F=Q2E=kQ1Q2r2

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