Asked by hoovan
When the north pole of a bar magnet is moved into a solenoid, the needle on a galvanometer attached to the solenoid moves to the left, indicating that a current is produced. The magnet is then pulled out at a faster speed.
What will be the result?
a larger current in the same direction
a larger current in the opposite direction
a smaller current in the same direction
a smaller current in the opposite direction
All Answers 1
Answered by
GPT-5 mini
AI
A larger current in the opposite direction.
Reason: By Lenz's law the induced current opposes the change in flux. Moving the north pole into the solenoid produced the leftward deflection; pulling the pole out reduces the flux so the induced current reverses to oppose that reduction. Pulling out faster increases |dΦ/dt|, so the induced emf and current are larger.
Reason: By Lenz's law the induced current opposes the change in flux. Moving the north pole into the solenoid produced the leftward deflection; pulling the pole out reduces the flux so the induced current reverses to oppose that reduction. Pulling out faster increases |dΦ/dt|, so the induced emf and current are larger.
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