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JEE Main2009PhysicsMagnetic Effects of CurrentActual

Due to the presence of the current l ₁ at the origin

Options

  1. AThe forces on A B and D C are zero
  2. BThe forces on A D and B C are zero
  3. CThe magnitude of the net force on the loop is given by ₀ I₁ 4 [2(b-a)+ 3 (a+b) ]
  4. DThe magnitude of the net force on the loop is given by ₀ |₁ 24 a b (b-a)

Correct answer

B. The forces on A D and B C are zero

Step-by-step solution

The forces on A D and B C are zero because magnetic field due to a straight wire on A D and B C is parallel to elementary length of the loop.

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