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NCERT Class XII Chapter
Moving Charges and Magnetism
Questions With Solutions

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Question : 1
Total: 28
A circular coil of wire consisting of 100 turns, each of radius 8.0 cm carries a current of 0.4 A. What is the magnitude of the magnetic field B at the centre of the coil?
Solution:  
The magnetic field at the centre of a circular coil having 100 turns.
B = (
µ0I
2r
) N or B = [
4π×10−7×0.4
2×8×102
] × 100
B = 3.14 × 10−4 T
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