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MHT CET202121 Sep 2021Evening ShiftPhysicsElectromagnetic InductionActual

The magnetic flux near the axis and inside the air core solenoid of length 60 ~cm carrying current ' I ' is 1.57 10⁻⁶ ~Wb . Its magnetic moment will be [ ₀=4 10⁻⁷ . , SI unit and cross sectional area is very small as compared to length of solenoid.]

Options

  1. A1 Am ^2
  2. B0.25 Am ^2
  3. C0.5 Am ^2
  4. D0.75 Am ^2

Correct answer

D. 0.75 Am ^2

Step-by-step solution

Magnetic field inside the solenoid is given by aligned & B = ₀ NI L & A = ₀ NI L & Magnetic moment, NIA = L ₀ & = 1.5 10⁻⁶ 0.6 4 3.14 10⁻⁷ & =0.75 Am ^2 aligned

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