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BITSAT2016PhysicsMagnetic Effects of CurrentActual

A wire carrying current I has the shape as shown in adjoining figure. Linear parts of the wire are very long and parallel to X -axis while semicircular portion of radius R is lying in Y-Z plane. Magnetic field at point O is:

Options

  1. AB =- ₀ 4 I R ( i 2 k )
  2. BB =- ₀ 4 I R ( i +2 k )
  3. CB = ₀ 4 I R ( i -2 k )
  4. DB = ₀ 4 I R ( i +2 k )

Correct answer

B. B =- ₀ 4 I R ( i +2 k )

Step-by-step solution

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