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NEET2014PhysicsCurrent ElectricityActual

The resistance in the two arms of the meter bridge are 5   Ω and R Ω , respectively. When the resistance R is shunted with an equal resistance, the new balance point is at 1.6 l 1 . The resistance ‘ R ’ is:

Options

  1. A10 Ω
  2. B15 Ω
  3. C20 Ω
  4. D25 Ω

Correct answer

B. 15 Ω

Step-by-step solution

The resistance of meter bridge is directly proportional to the length of the bridge wire. 5 R = l 1 100 - l 1 5 R / 2 = 1.6 l 1 100 - 1.6 l 1 Solving l 1 = 25   c m and R = 15   Ω

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