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MHT CET202121 Sep 2021Morning ShiftPhysicsCurrent ElectricityActual

Two wires ' A ' and ' B ' of equal length are connected in left and right gap respectively of meter bridge, null point is obtained at 40 ~cm , from the 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

Options

  1. A6: 1
  2. B8: 1
  3. C16: 1
  4. D12: 1

Correct answer

A. 6: 1

Step-by-step solution

aligned & R_A R_B = 40 60 = 2 3 & R= A = r^2 & R_A R_B = _A _B ( r_B r_A )^2 & 2 3 = _A _B ( 1 3 )^2 & _A _B =6 aligned

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