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NEET2026PhysicsCurrent ElectricityActual

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

Options

  1. AOnly the left-sided deflection
  2. BThere will be no deflection irrespective of the position of the jockey
  3. COnly the right-sided deflection
  4. DBoth right-sided and left-sided deflection and at balance point, no deflection

Correct answer

D. Both right-sided and left-sided deflection and at balance point, no deflection

Step-by-step solution

Let the nodes of the circuit be identified as follows: Node A: Left L-shaped metallic strip. Node B: Right L-shaped metallic strip. Node C: Central metallic strip. Node D: The point on the wire where the jockey touches. The resistances in the four arms of the circuit are: 1. Resistance between A and C is R₁ . 2. Resistance between B and C is R₂ . 3. Resistance between A and D is R_ AD (left part of the metre bridge wire). 4. Resistance between B and D is R_ DB (right part of the metre bridge wire). In the given fig

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