# 1. A circular coil of wire consisting of 100 turns, each of radius 8.0 cm carries a current of 0.40 A. What is the magnitude of the magnetic field B at the centre of the coil?

The magnitude of the magnetic field at the centre of a circular coil of radius r carrying current  I is given by,

For 100 turns, the magnitude of the magnetic field will be,

(current=0.4A, radius = 0.08m, permeability of free space = 410-7 TmA-1)

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