NEET Physics Question - Current Electricity - Measuring Devices ( Galvanometer, Voltmeter and Ammeter & Meter Bridge )

Assertion (A): The emf of the driver cell in the potentiometer experiment should be greater than the e.m.f. of the cell to be determined.

Reason (R): The fall of potential drop across the potentiometer wire should be less than the e.m.f. of the cell to be determined.

(1) Both (A) & (R) are true and the (R) is the correct explanation of the (A)

(2) Both (A) & (R) are true but the (R) is not the correct explanation of the (A)

(3) (A) is true but (R) is false

(4) Both (A) and (R) are false

Solution:

For a potentiometer to function, the driver cell's EMF must exceed the unknown EMF to ensure a balancing point can be found. The potential drop across the entire potentiometer wire must be greater than the unknown EMF. Reason (R) states the opposite, making it false.

Rankers Physics

Potentiometer Driver EMF

Solution:

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