Two conducting loops carry equal currents l in the same direction as shown in fi

Question

Two conducting loops carry equal currents l in the same direction as shown in figure. If the current In the upper loop suddenly drops to zero, w at will happen to the current in the lower loop according to Lenz's law? The current in the lower loop will decrease. The current in the lower loop will increase. The current in the lower loop will not change. The current in the lower loop will also drop to zero. A circular coil has 275 turns and a radius of 0.045 m. The coil is used as an AC generator by rotating it in a 0.500 T magnetic field, as shown in the figure. At what angular speed should the coil be rotated so that the maximum emf is 175 V? 28 rad/s 50 rad/s 130 rad/s 200 rad/s

Explanation / Answer

13.

by the upper loop , magnetic field at the location of lower loop is in upward direction. as the current in upper loop decreases , the magnetic flux linked with lower loop decreases. hence to oppose the change the lower loop induces current in it to have the magnetic field in upward direction .hence the induced current is in same direction as the current already present in lower loop . hence the net current in lower loop increases

B

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