Question

1 point
109. Magnetic field at the
centre of a circular loop if
area A is B. The magnetic
moment of the loop will be​

Answer 1

Answer:

Let r be the radius of the circular loop.

∴ A = πr2   or r = πA

Magnetic field at the centre of the loop is 

B = 2rμ0I=2πAμ0I    or    I=μ02BπA

The magnetic moment of the loop is

M= IA = μ02BπAA = μ0π2BAA

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