Q104 / 120 · VITEEE 2016 · Physics

A potentiometer circuit shown in the figure is set up to measure emf of cell $\mathrm{E}$. As the point $\mathrm{P}$ 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 $Y$ may be obtained by Figure

  • A
    decreasing the resistance $R$ and decreasing $V$
  • Correct answer
    B
    decreasing the resistance $R$ and increasing $V$
  • C
    increasing the resistance $R$ and increasing $V$
  • D
    increasing the resistance $R$ and decreasing $V$.

Solution

Decreasing R increases current 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 $\mathrm{V}$.

Hence, the correct answer is option: 'B'.

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