The mutual inductance of two circuits is the coefficient of proportionality between the current in one of the circuits and the magnetic flux created by it, which penetrates the second circuit. Determine the mutual inductance of: a) two circular circuits of radius r and R located on the same axis of symmetry at a distance from each other l ≫ r, R; b) a long solenoid of radius r containing n turns per unit length, and a circular circuit covering this solenoid.
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10 The motion of charged particles in complex fields
10.1 Motion in a homogeneous magnetic field