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PhysicsNEET 2020Biot–Savart and Ampère's laws

Moving Charges and Magnetism

A long solenoid of 50 cm length having 100 turns carries a current of 2.5 A. The magnetic field at the centre of the solenoid is: (μ0=4π×10−7 T m A−1\mu_0 = 4\pi \times 10^{-7}\ \mathrm{T\,m\,A^{-1}})

  1. A.6.28×10−46.28 \times 10^{-4} T✓
  2. B.3.14×10−43.14 \times 10^{-4} T
  3. C.6.28×10−56.28 \times 10^{-5} T
  4. D.3.14×10−53.14 \times 10^{-5} T

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