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MHT CET Medical202625 April 2026Evening ShiftPhysicsCurrent ElectricityActual

A potentiometer wire of 400 cm length has a resistance of 20 . It is connected in series with a resistance of 15 and a accumulator of EMF 6 V (negligible internal resistance). The potential gradient k = x 7 V/m . The value of x is

Options

  1. A6
  2. B7
  3. C4
  4. D8

Correct answer

A. 6

Step-by-step solution

Total resistance of the circuit is R_ total = R_w + R_s = 20 + 15 = 35 . Current in the circuit is I = E R_ total = 6 35 A . Potential difference across the potentiometer wire is V_w = I R_w = 6 35 20 = 24 7 V . Length of the potentiometer wire is L = 400 cm = 4 m . Potential gradient is k = V_w L = 24 7 4 = 6 7 V/m . Given k = x 7 V/m , comparing the two expressions yields x = 6 . Answer: 6

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