A current flowing through a conductor generates a around the conductor, which is described by . The total through a circuit is equal to the product of the perpendicular component of the magnetic flux density and the area of the surface spanning the current path. If the current varies, the through the circuit changes. By , any change in flux through a circuit induces an (EMF, ) in the circuit, proportional to t. Electromagnetic torques generated by mutual inductance between energized coils are widely used in aerospace applications, especially for solar panel deployment. Accurate and rapid acquisition of mutual inductance between coils is essential to provide the necessary electromagnetic force.
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