1
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Choose the correct answer from the options given below :
- Both (A) and (R) are true and (R) is the correct explanation of (A)
- Both (A) and (R) are true but (R) is NOT the correct explanation of (A)
- (A) is true but (R) is false
- (A) is false but (R) is true
Answer
(2) Both (A) and (R) are true but (R) is NOT the correct explanation of (A)
Solution
In electrostatic equilibrium E=0 everywhere inside a conductor. By Gauss's law the charge enclosed by any closed surface inside it is zero, so excess charge resides only on the surface. (A) is true.
Between the plates of a charged capacitor there is a field E= 0; a free charge q placed there experiences a force qE and drifts. (R) is true.
(R) is about charges in the field between capacitor plates; it does not explain (A), which follows from E=0 inside a conductor and Gauss's law.
Answer: (2)
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