Question

A circular coil of closely wound N turns and radius r carries a current 7. Write the expressions for the following:
(i)The magnetic field at its centre.
(ii)The magnetic moment of this COil.

Answer 1

Answer:

The ans is in Attachment

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Answer 2

(i) : Magnetic field at the center B=

2r

μ

o

IN

(ii) : Area of the coil A=πr

2

∴ Magnetic moment of the coil μ=INA=πr

2

IN.