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JEE Main2009PhysicsMagnetic Effects of CurrentActual

The magnitude of the magnetic field (B) due to loop A B C D at the origin (O) is

Options

  1. Azero
  2. B₀(b-a) 24 a b
  3. C₀ I 4 [ b-a a b ]
  4. D_o 4 [2(b-a)+ 3 (a+b) ]

Correct answer

B. ₀(b-a) 24 a b

Step-by-step solution

Net magnetic field due to loop A B C D at O is aligned & B=B_ A B +B_ B C +B_ C D +B_ D A & =0+ _o I 4 a 6 +0- _o I 4 b 6 = _o I 24 a - _o I 24 b = _o I 24 a b (b-a) aligned

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