Question

A current in a secondary coil is induced only if:

Answer 1

B is the correct answer, only CHANGES in magnetic flux generate currents, steady magnetic fields do nothing, and as such steady currents will generate a steady magnetic field, but it will not change the magnetic field and will not generate more current in another coil, so A is incorrect. More turns would generate a stronger magnetic field, but not a changing magnetic field that could create currents in other coils, so D is wrong for the same reason as A. C is wrong because there is no picture to judge for one, but magnetic fields are always perpendicular to their mother currents, but it doesn't do anything that would generate a current in another coil.