RE-NEET 2026 Physics Electric Field MCQ Question
A point charge Q is placed inside a cavity within a solid isolated conducting sphere. Consider points A, B and C as shown in the figure, where the magnitudes of the electric fields are E_A, E_B and E_C respectively. The points B and C are at the same distance from the center of the solid sphere. The correct option is:
E_A ≠ 0, E_B = E_C
E_A = 0, E_B > E_C
E_A ≠ 0, E_B < E_C
E_A = 0, E_B = E_C
Correct Answer
Detailed Explanation
In this scenario, a point charge inside a cavity of a conducting sphere induces a charge on the inner surface of the cavity, resulting in an electric field at point A that is not zero. However, due to the properties of conductors, the electric field outside the cavity (at points B and C) is influenced by the induced charges on the sphere's surface.
Since points B and C are equidistant from the center, the induced charges will create equal electric fields at these points, leading to . Thus, the correct relation is and , confirming option A.
The other options fail because they either incorrectly state the electric field at point A as zero or misrepresent the relationship between and .
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