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MHT CET202613 April 2026Morning ShiftPhysicsCurrent ElectricityActual

A potentiometer wire is 4 m long and potential difference of 3V is maintained between the ends. The e.m.f. of the cell which balances against a length of 100 cm of the poteniometer wire is

Options

  1. A0.25 V
  2. B0.50 V
  3. C0.75 V
  4. D1.0 V

Correct answer

C. 0.75 V

Step-by-step solution

Length of the potentiometer wire, L = 4 m = 400 cm Potential difference across the wire, V = 3 V Potential gradient of the wire, k = V L = 3 400 V/cm Balancing length for the cell, l = 100 cm The e.m.f. of the cell is given by E = k l E = ( 3 400 ) 100 = 3 4 = 0.75 V Answer: 0.75 V

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