Questions
A and B are two metallic rings placed at opposite sides of an infinitely long straight conducting wire as shown in figure. If current in the wire is slowly decreased, the direction of the induced current will be
detailed solution
Correct option is B
For ring A : the magnetic field goes outside the plane of the paper. As current in wire decreases, the value of magnetic field also decreases. As per Lenz's law, to oppose this change, current is induced in anticlockwise direction so as to increase the falling value of magnetic field.For ring B : the magnetic field goes inside the plane of the paper. As current in wire decreases, the value of magnetic field also decreases. As per Lenz's law, to oppose this change, current is induced in clockwise direction so as to increase the falling value of magnetic field.Talk to our academic expert!
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Two different coils have self-inductance mH, . The current in one coil is increased at a constant rate. The current in the second coil is also increased at the same rate. At a certain instant of time, the power given to the two coils is the same. At that time the current, the induced voltage and the energy stored in the first coil are and respectively. Corresponding values for the second coil at the same instant are and respectively. Then
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