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JEE Main202117 Mar 2021Morning ShiftPhysicsMagnetic Effects of CurrentActual

A solenoid of 1000 turns per metre has a core with relative permeability 500 . Insulated windings of the solenoid carry an electric current of 5 A . The magnetic flux density produced by the solenoid is: (Permeability of free space = 4 π × 10 - 7 H m - 1 )

Options

  1. Aπ   T
  2. B2 × 10 - 3 π   T
  3. Cπ 5   T
  4. D10 - 4 π   T

Correct answer

A. π   T

Step-by-step solution

B = μ n I = μ 0 μ r n I B = 4 π × 10 - 7 × 500 × 1000 × 5 B = π Tesla

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