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NEET2005PhysicsMagnetic Effects of CurrentActual

A coil in the shape of an equilateral triangle of side l is suspended between the pole of a permanent magnet such that B is in plane of the coil. If due to current i in the triangle a torque acts on it, the side l of the triangle is:

Options

  1. A2 3 ( B i )
  2. B2 ( 3 B i )^ 1 / 2
  3. C2 3 ( B i )^ 1 / 2
  4. D1 3 B i

Correct answer

B. 2 ( 3 B i )^ 1 / 2

Step-by-step solution

Since I=M B=(I A) B=I 3 4 l^2 B l=2 ( I 3 B I )^ 1 / 2

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