Question

Find the magnetic moment of a thin round loop with current if radius of loop is r and magnetic induction at center is b

Answer 1

your question is half correct in

Answer 2

Answer:

Explanation:

The magnetic moment of a current carrying coil is given by  =n i A n

Where,

n is the number of loops  

i is the current through the coil

A is the area of cross section of the coil

n is the unit vector along the direction of the magnetic moment

to find n, imagine the coil in front of you such that the current in the coil is flowing in counter-clockwise direction

Now curl your fingers along the circumference of the loop, you thumb will point in the direction of n which is also the direction of the magnetic moment of the loop

Hope this helps ;)