Question

A circular coil is made from a wire of length 2m it’s radius 4/pi cm current 1 A passes through it then magnetic moment

Answer 1

Answer:

Explanation:

4/100 ampere per meter square

Answer 2

The magnetic moment is $0.01273Am^2$.

Explanation:

The magnetic moment for a circular coil is given as

$m=NIA$

Here N is the number of turns, I is the current passes through the coil and A is the area.

As l = 2 m length of the wire is bent to form a circular coil then

$N2\pi r=l=2m$

here r is the radius of the circle,

$N=\frac{2m}{2\pi\times\frac{4}{100\times\pi}m }$

N = 25

Given  I = 1 A .

substitute the values, we get  

$m=25\times1A\times\pi\times\frac{(4)^2}{(100\times\pi)^2}$

$m = \frac{4}{100\times3.14} Am^2$

$m=0.01273Am^2$

Thus, the magnetic moment is $0.01273Am^2$.

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