Consider a conductor with a spherical cavity in it. A point charge \( q_{0} \) is placed at the centre of cavity
\( \mathrm{P} \) and a point charge \( Q \) is placed outside conductor.
W
Assertion :- Total charge induced on cavity wall is equal and opposite to the charge inside.
Reason :- If cavity is surrounded by a Gaussian surface, where all parts of Gaussian surface are located inside the conductor, \( \oint \overrightarrow{\mathrm{E}} \cdot \mathrm{d} \overrightarrow{\mathrm{A}}=0 \); hence \( \mathrm{q}_{\text {induced }}=-\mathrm{q}_{0} \)
(a) Both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
(b) Both Assertion and Reason are correct but Reason is not the correct explanation of Assertion.
(c) Assertion is correct but Reason is incorrect.
(d) Assertion is incorrect but Reason is correct.
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