question_answer 34)

    A magnetic field in a certain region is given by  and a coil of radius with resistance R is placed in the x-y plane with its centre at the origin in the magnetic field, Fig. 4(EP).7. Find the magnitude and the         direction of the current at (, 0, 0) at and                                                                                   

Answer:

                    Here, i.e., magnetic field is along positive z-axis, Fig. 4(EP).7 Magnetic flux linked with the ring emf induced in the ring,             current induced, At   , , along   At  ,   At  , , along   Note that the direction of current at any instant is as per Lenz's law.