MHT CET 2025 Physics question
A circular coil carrying current 'I' has a radius 'r' and 'n' turns. The magnetic field along the axis of a coil at a distance ' r' from its centre is ( = permeability of free space, n is very small)
Answer: (C)
Solution
The field on the axis of a coil of n turns at distance x from its centre is . With : , so .
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