Question

Is it correct that bringing the N pole of the magnet toward and then away from a clockwise wound coil will cause a negative and then positive deflection or pulse on the galvanometer? If this is correct or not can SOMEONE please explain how the N pole magnet is causing the deflection in whatever direction based on how the coil is wound?

Answer 1

This is because of electromagnetic induction. According to this when magnetic flux changes for a closed area wrt time then a emf is induced in the conductor which opposes the change. And also it doen not depend on how coil is wounded. Emf will generate when there is a change in flux. And it's direction depends on whether north or south pole of magnet is there or whether it is moving towards or away from it. Lenz law explains the direction. When you bring north pole towards the coil so an emf will generate and current will flow in the coil to oppose the change in magnetic field. So the direction of current will be in anti clock wise direction as seen from magnet. This direction is given by right hand thumb rule. Similarly when north pole goes away current will flow in opposite direction.