A wire is bent into the shape of a circle of radius r = 0.10 m and carries a 20.0-A current in the direction shown.
-Determine the magnetic moment of the loop.

Question

A wire is bent into the shape of a circle of radius r = 0.10 m and carries a 20.0-A current in the direction shown. 
-Determine the magnetic moment of the loop.

Quizplus · Accepted Answer

The magnetic moment of a loop is defined as the product of the current and the area enclosed by the loop, i.e. 
M = IΑ
For a circle of radius r, the area is given by Α = πr^2
Substituting the given values, we get 
M = (20 A)(π(0.10 m)^2) = 0.63 A·m^2
Therefore, the best choice is C, 0.63 A·m^2.

A Wire Is Bent into the Shape of a Circle