Created by Arghya Sen The magnetic moment of a planar current loop is , where is the enclosed area and the direction is given by the right-hand rule along the loop's current sense. For composite shapes, the total area is the sum (or difference) of the areas of the individual geometric pieces making up the loop.
A current-carrying loop lies in the -plane, shaped as shown in a standard textbook figure: it consists of a square loop of side with two semicircular lobes of radius attached on opposite sides, with current flowing around the loop in a sense such that the unit vector (out of the page) gives the direction of the magnetic moment. What is the magnetic moment of this current loop?
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← A current I flows through a closed loop made of two straight radial segments (which pass through the centre O and so contribute no field there) joined by two circular arcs of radius R, as shown in a typical textbook figure where the arcs subtend an angle 2θ and (2π-2θ) respectively at O. What is the magnitude of the magnetic field at the centre O?A rectangular current loop (magnetic moment m=IA) is placed in a uniform external magnetic field B. For what orientation of the loop is it in (1) stable equilibrium and (2) unstable equilibrium? →
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