One coil is placed on top of another. The bottom coil is connected in series to
ID: 1332615 • Letter: O
Question
One coil is placed on top of another. The bottom coil is connected in series to a battery and a switch. With the switch closed, there is a clockwise current in the bottom coil. When the switch is opened, the current in the bottom coil decreases abruptly to zero. What is the direction of the induced current in the top coil, as seen from above while the current in the bottom coil decreases?
Clockwise Counterclockwise Zerothe current is induced only when the coils move relative to each other There is not enough information to answer this question.Explanation / Answer
the corrct option is clock wise.
Right-hand rule states that, when the fingers wrapped around the wire the direction of the conventional current (clock wise), then the magnetic field is induced along the thumb points (downward). That is upper part of the bottom coil acts as magnetic South Pole.
Again use right hand rule to estimate the direction of the current in the upper coil.
Right-hand rule states that, when the thumb points the direction of the magnetic field (downward), the fingers wrapped around the wire gives the direction of the conventional current. That is clock wise.
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