Question

A potentiometer circuit shown in the figure is set up to measure emf of 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. The balance point between X and Y maybe obtained by

• A. Decreasing the resistance R and decreasing V
• B. Decreasing the resistance R and increasing V
• C. Increasing the resistance R and increasing V
• D. Increasing the resistance R and decreasing V

Answer 1

The correct option is B Decreasing the resistance R and increasing V

Decreasing R increase in XY and there by increases the potential drop across XP and the balance point may be obtained. The current may be increased also by increasing V.