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JEE Main201815 Apr 2018Morning ShiftPhysicsCurrent ElectricityActual

In a meter bridge, as shown in the figure, it is given that resistance Y=12.5 and that the balance is obtained at a distance 39.5 ~cm from end A (by jockey J). After interchanging the resistances X and Y , a new balance point is found at a distance l₂ from end A . What are the values of X and l₂ ?

Options

  1. A19.15 and 39.5 ~cm
  2. B8.16 and 60.5 ~cm
  3. C19.15 and 60.5 ~cm
  4. D8.16 and 39.5 ~cm

Correct answer

B. 8.16 and 60.5 ~cm

Step-by-step solution

For a balanced meter bridge, aligned & X 39.5 = Y (100-39.5) & Y =39.5= X (100-39.5) &or X = 12.5 39.5 60.5 =8.16 aligned When X and Y are interchanged l₁ and (100 -l₁ ) will also interchange so, l₂=60.5 ~cm

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