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NEET2021PhysicsCurrent ElectricityActual

In a potentiometer circuit a cell of EMF 1 . 5   V gives balance point at 36   cm length of wire. If another cell of EMF 2 . 5   V replaces the first cell, then at what length of the wire, the balance point occurs?

Options

  1. A64   cm
  2. B21 . 6   cm
  3. C60   cm
  4. D62   cm

Correct answer

C. 60   cm

Step-by-step solution

Given, E 1 = 1 . 5   V l 1 = 36   cm E 2 = 2 . 5 v l 2 = ? AS we know, E 1 E 2 = l 1 l 2 1 · 5 2 · 5 = 36 l 2 3 5 = 36 l 2 l 2 = 60   cm

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