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An uncharged conducting body has a spherical cavity. A point charge Q is placed at the exact centre of the cavity. Consider the following four points: Point 1 — inside the cavity, near the cavity wall Point 2 — just outside the conductor surface Point 3 — inside the bulk of the conductor Point 4 — just outside the conductor surface at a different location Column-II options: (P) Ex = 0, (Q) Ey = 0, (R) Ex ≠ 0, (S) Ey ≠ 0, (T) None of these. Which of the following correctly matches Point 3 (inside bulk of conductor) with Column-II?
- (A) P, Q
- (B) R, S
- (C) P, R
- (D) Q, T
Correct answer: (A) P, Q
Solution
Inside the bulk of a conductor (Point 3) the net electric field is zero regardless of external or internal charges, so both Ex = 0 and Ey = 0, matching options P and Q.
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