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JEE Main2008PhysicsMagnetic Effects of CurrentActual

A horizontal overhead power line is at a height of 4 ~m from the ground and carries a current of 100 ~A from east to west. The magnetic field directly below it on the ground is ( ₀=4 10⁻⁷ ~T ~m ~A ⁻¹ )

Options

  1. A2.5 10⁻⁷ ~T southward
  2. B5 10⁻⁶ ~T northward
  3. C5 10⁻⁶ T southward
  4. D2.5 10⁻⁷ northward

Correct answer

C. 5 10⁻⁶ T southward

Step-by-step solution

B= ₀ 2 i R = 4 10⁻⁷ 2 100 4 =5 10⁻⁶ ~T southward

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