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(Part 1) A special metal S conducts electricity without any resistance. A closed wire loop, made of S, does not allow any change in flux through itself by inducing a suitable current to generate a compensating flux. The induced current in the loop cannot decay due to its zero resistance. This current gives rise to a magnetic moment which in turn reples the source of the magnetic field or flux. A magnetic dipole of moment m is brought along the axis of this loop from infinity to r is much, much less than a. The magnitude of the dipole’s magnetic field is (u0)(m)/[2(pi)r^3]. The magnitude of the force between the two magnetic dipoles with moments m1 and m2 is (k)(m1)(m2)/(r^4). The current induced in the loop will be proportional to:
A) m/r^3
B) m^2/r^2
C) m/r^2
D) m^3/r

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