Question

A potentiometer circuit shown in the figure is set up to measure emf of a cell E. As the point P moves from X to Y. The galvanometer G shows deflection always in one direction but the deflection decreases continuously until Y is reached. In order to obtain null point between X and Y we need to-

• A. Decrease R
• B. Increase R
• C. Reverse the terminals of V
• D. Reverse the terminals of E

Answer 1

Answer: (A)

Decrease R

Answer 2

Increase K so reduce R