A wire loop consists of two semicircles connected by straight segments (see figu

Question

A wire loop consists of two semicircles connected by straight segments (see figure below). The inner and outer radii are R1 = 0.1 and R2 = 0.9m, respectively. A current of I = 1.5 A flows in this loop with the current in the outer semicircle in the clockwise direction.

What is the magnetic moment of this current loop?

Direction?

into the paper

to the left

up

to the right

out of the paper

down

Thanks!

A wire loop consists of two semicircles connected by straight segments (see figure below). The inner and outer radii are R1 = 0.1 and R2 = 0.9m, respectively. A current of I = 1.5 A flows in this loop with the current in the outer semicircle in the clockwise direction. What is the magnetic moment of this current loop? Direction? into the paper to the left up to the right out of the paper down Thanks!

Explanation / Answer

magnetic moment = I*(A2-A1)

= I*(pi*R2^2 - pi*R1^2)/2

= 1.5*(pi*0.9^2 - pi*0.1^2)/2

= 1.885 A.m^2

into the page

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