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BITSAT2010PhysicsMagnetic Effects of CurrentActual

The magnetic field at the origin due to the current flowing in the wire is -

Options

  1. A- ₀ I 8 a ( i + k )
  2. B₀ I 2 a ( i + k )
  3. C₀ I 8 a (- i + k )
  4. D₀ I 4 a 2 ( i - k )

Correct answer

C. ₀ I 8 a (- i + k )

Step-by-step solution

B _ OD =0, ~B _ OB =0 ~B _ AB = ₀ I 4 a 2 [ 45^ (- i )+ 45^ k ]= ₀ I 8 a (- i + k )

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