Question

Assertion : Voltmeter is much better than a potentiometer for measuring emf of cell.
Reason : A potentiometer draws no current while measuring emf of a cell.

• A. Both (A) and (R) are true and (R) is the correct explanation of A
• B. Both (A) and (R) are true but (R) is not the correct explanation of A.
• C. (A) is true but (R) is false
• D. (A) is false but (R) is true

Answer 1

Answer: (D)

(A) is false but (R) is true

There is no ideal Voltmeter. Every Voltmeter, draws at least some amount of current. But the potentiometer wire's length can be adjusted such that it draw no current.