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Obtain an expression for magnetic flux density at the centre of a current carrying circular coil.
Obtain an expression for magnetic flux density $B$ at the centre of a current carrying circular coil.
Given: A circular coil of radius $r$ carrying current $I$
To show: $B = \frac{\mu_0 I}{2r}$
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From ISC 2023 Specimen Physics Paper 1, question 11.