Question

Imagine pushing the bar magnet N-pole first into the end of the wire coil with the number label on it. Predict if the current sensor will read positive or negative current based on your knowledge of the magnetic fields of bar magnets, the magnetic fields of wires carrying current, the configuration of the wire windings of the coil, right hand rules for magnetic fields, and the connection of the current sensor. illustrate your method of prediction with the aid of some simple cartoons. Your explanation should be consistent with Lenz's Law.

Answer 1

Lenz law states that the direction of induced current will be such that it opposes the very cause of its production.

In the case illustrated in the question, the north pole of the magnet is pushed into the end of the wire loop the induced current will be produced such that it opposes the very cause of its production. Since the flux through the loop is increasing as the magnet id pushed in the loop so the induced current will produce its magnetic field to oppose the increase of magnetic flux so magnetic field of the loop current will be opposite to that of magnet's north pole.

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