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NEET 2022 (Phase 1) · Ampere's Law, Cylinders, Solenoid & Toroid

Ampere's Law, Cylinders, Solenoid & Toroid question from NEET 2022 (Phase 1)

Q33NEET 2022 · PHASE 1Easy

Ampere's Law, Cylinders, Solenoid & Toroid

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

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Answer: (b)

  1. n=100n = 100 turns/mm =105= 10^{5} turns/m; B=μ0nIB = \mu_0 n I (radius not needed).
  2. B=4π×10−7×105×1=0.1256B = 4\pi \times 10^{-7} \times 10^{5} \times 1 = 0.1256 T.
  3. So the answer is (b) 12.56×10−212.56 \times 10^{-2} T.
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