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PhysicsNEET 2022Biot–Savart and Ampère's laws

Moving Charges and Magnetism

A long solenoid of radius 1 mm has 100 turns per mm. If 1 A current flows in the solenoid, the magnetic field strength at the centre of the solenoid is:

  1. A.6.28×10−46.28 \times 10^{-4} T
  2. B.6.28×10−26.28 \times 10^{-2} T
  3. C.12.56×10−212.56 \times 10^{-2} T✓
  4. D.12.56×10−412.56 \times 10^{-4} T

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