A conductor having a cavity is given a positive charge. Then field strength `E_(A) , E_(B)and E_(C)` at point A( within cavity ), at B ( within conducutor but outside cavity ) and C( near conductor and outside ) respectively will be :

Assertion : In a cavity within a conductor, the electric field is zero. Reason : Charges in a conductor reside only at its surface.

(A) : In a cavity within a conductor, the electric field is zero. (R ): Charges in a conductor reside only at its surface.

We have a fixed conductor having a cavity inside. There is a point charge q_(1) kept inside the cavity charge appearing at the inner surface of the cavity is q_(2) . Charge appearing at outer surface of conductor is q_(3) and there lies another point charge q_(4) out side the conductor. Whole situation is shown in figure. q_(4) . is held stationary by applying an external force vecF_(0) on it. Three points A, B and C are shown. Answer the following two questions. Q. If keeping the magnitude and nature of q_(1) fixed position of q_(1) is changed inside the cavity. Then choose the correct option(s)

We have a fixed conductor having a cavity inside. There is a point charge q_(1) kept inside the cavity charge appearing at the inner surface of the cavity is q_(2) . Charge appearing at outer surface of conductor is q_(3) and there lies another point charge q_(4) out side the conductor. Whole situation is shown in figure. q_(4) . is held stationary by applying an external force vecF_(0) on it. Three points A, B and C are shown. Answer the following two questions. Q. If keeping the nature and position of q_(1) fixed, magnitude of q_(1) is changed, then choose the INCORRECT options(s)