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JEE Main20199 Jan 2019Morning ShiftPhysicsMagnetic Effects of CurrentActual

A current loop, having two circular arcs joined by two radial lines is shown in the figure. It carries a current of 10 A . The magnetic field at point O will be close to:

Options

  1. A1.5 × 10 - 7 T
  2. B1.0 × 10 - 7 T
  3. C1.5 × 10 - 5 T
  4. D1.0 × 10 - 5 T

Correct answer

D. 1.0 × 10 - 5 T

Step-by-step solution

Magnetic field due to P Q and R S are zero at ' O '. Magnetic field due to Q R B Q R = μ 0 4 π 10 3 × 10 - 2 π 4 (outwards) Magnetic field due to S P B S P = μ 0 4 π 10 5 × 10 - 2 π 4 (inwards) Net field B = μ o 4 π 10 π 4 × 10 - 2 1 3 - 1 5 = 1.0 × 10 - 5 T

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