IIT-JEE 2008 · Paper 2 · Physics Q34

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PhysicsAssertion and reason+3 / -1Question 34 of 66

STATEMENT-1: For practical purposes, the earth is used as a reference at zero potential in electrical circuits.

and

STATEMENT-2: The electrical potential of a sphere of radius $R$ with charge $Q$ uniformly distributed on the surface is given by $\dfrac{Q}{4\pi\varepsilon_0R}$ .

STATEMENT-1 is True, STATEMENT-2 is True; STATEMENT-2 is a correct explanation for STATEMENT-1

STATEMENT-1 is True, STATEMENT-2 is True; STATEMENT-2 is NOT a correct explanation for STATEMENT-1

STATEMENT-1 is True, STATEMENT-2 is False

STATEMENT-1 is False, STATEMENT-2 is True

Answer and worked solution

Official answer: A

Statement 2. A sphere with surface charge has potential $\dfrac Q{4\pi\varepsilon_0R}$ . True.

Statement 1. For the Earth, $R$ is enormous, so even large charges added or removed change its potential negligibly; it is a stable reference, taken as zero. True, and Statement 2 is the reason.

(A)

Topics:Electric potential Conductors and charge distribution

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IIT-JEE 2008 · Paper 2, Physics question 34