Magnetic field intensity at the centre of a coil of 50 turns,

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Magnetic field intensity at the centre of a coil of 50 turns, radius 0.5 m and carrying a current of 2 A is

1. 0.5 × 10^–5 T
2. 1.25 × 10^–4 T
3. 3 × 10^–5 T
4. 4 × 10^–5 T

Correct Option: B

We know that magnetic field at the centre of circular coil,

B =	μ₀In	=	4π × 10^-7 × 2 × 50	= 1.05 × 10^-4N
	2r		2 × 0.5