Practice portal › Current Electricity › Wheatstone Bridge, Metre Bridge and Potentiometer

In a metre bridge experiment (see figure), the positions of the cell, E, and galvanometer, G, are interchanged. We shall observe in the galvanometer:

Asked in NEET 2026 · Metre bridge

• (1) Only the left-sided deflection
• (2) Both right-sided and left-sided deflection and at balance point, no deflection
• (3) Only the right-sided deflection
• (4) There will be no deflection irrespective of the position of the jockey

Step-by-step solution

Why the other options are wrong

• (1) A deflection on one side only would mean the bridge never balances; the balance point does not move when the cell and galvanometer are interchanged, so the deflection reverses as the jockey crosses it.
• (3) Same error as the left-sided option: the bridge still has a balance point, and the deflection changes side on either side of it.
• (4) The galvanometer is still across two points whose potentials differ except at one jockey position; the balance condition (R₁)/(R₂)=l/(100-l) is unchanged by the swap.

Reading this solution needs no sign-in. You only sign in to practise against the clock and keep your progress.