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MHT CET 2026 (13 Apr, Shift 1) · Wheatstone Bridge & Metre Bridge

Wheatstone Bridge & Metre Bridge question from MHT CET 2026 (13 Apr, Shift 1)

Q13MHT CET 2026 · 13 APR · SHIFT 1Medium

Wheatstone Bridge & Metre Bridge

Two wires A and B of equal lengths are connected in left and right gap respectively of a metre bridge, null point is obtained at 40 cm from left end. Diameters of the wires A and B are in the ratio 3:1 respectively, the ratio of specific resistance of A to that of B is

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Answer: (c)

  1. RARB=4060=23\dfrac{R_A}{R_B} = \dfrac{40}{60} = \dfrac{2}{3}
  2. Equal lengths, R∝ρd2R \propto \dfrac{\rho}{d^2}: ρAρB=RARB⋅(dAdB)2=23×9\dfrac{\rho_A}{\rho_B} = \dfrac{R_A}{R_B} \cdot \left(\dfrac{d_A}{d_B}\right)^2 = \dfrac{2}{3} \times 9
  3. ρAρB=6\dfrac{\rho_A}{\rho_B} = 6
  4. So the answer is (c) 6:16 : 1.
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