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NEET2024PhysicsMagnetic Effects of CurrentActual

A tightly wound 100 turns coil of radius 10 cm carries a current of 7 A . The magnitude of the magnetic field at the centre of the coil is (Take permeability of free space as 4 10⁻⁷ SI units):

Options

  1. A4.4 T
  2. B4.4 mT
  3. C44 T
  4. D44 mT

Correct answer

B. 4.4 mT

Step-by-step solution

The magnitude of magnetic field due to circular coil of N turns is given by aligned & B_C= ₀ i N 2 R & = 4 10⁻⁷ 7 100 2 0.1 & =4.4 10⁻³ ~T & =4.4 mT aligned

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