Two spherical cavities (A and B) of radii x and y are hollowed out from the interior of a conducting sphere of radius R. Charges q1 and q2 are placed at centre of cavities A and B. The situation is depicted in the figure given:

Which of the following is true if a third charge is placed near the conductor?
Answer & explanation
Correct answer: option 1
since charges enclosed inside the cavities will not change so the field and potential for cavity will not vary.