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JEE Main201912 Apr 2019Evening ShiftPhysicsMagnetic Effects of CurrentActual

Find the magnetic field at point P due to a straight line segment A B of length 6 c m carrying a current of 5 A . (See figure) μ 0 = 4 π × 10 - 7 NA - 2

Options

  1. A1.5 × 10 - 5 T
  2. B2.0 × 10 - 5 T
  3. C3.0 × 10 - 5 T
  4. D2.5 × 10 - 5 T

Correct answer

A. 1.5 × 10 - 5 T

Step-by-step solution

θ = 37 0 r = 4   c m B = μ 0 i 4 π r   [ s i n 37 ° + s i n 37 ° ] = 4 π × 10 - 7 5 4 π × 4 × 10 - 2 3 5 + 3 5 = 3 2 × 10 - 5 = 1.5 × 10 - 5   T

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