Suppose you moving the bar-magnet towards the coil as shown in the figure below.

Question

Suppose you moving the bar-magnet towards the coil as shown in the figure below. The coil is connected to a galvanometer (very sensitive device to measures current).

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a. Which way the magnetic flux pass through each turn of the coil, to the right or to the left?

b. Will the flux through each loop be increasing, decreasing or remains constant as you push the magnet into the coil?

c.Will there be an induced EMF? If so, which way will the induced EMF try to drive the current in the coil?

Explanation / Answer

The coil of wire is connected to the galvanometer. We observe the impulsive deflection of the galvanometer under a series of conditions. First, if we move the magnet towards the coil of wire, we see a deflection of the galvanometer. The deflection means that there is a current in the galvanometer coil circuit, hence an induced emf.

. If we move either the magnet or the coil faster, the deflection is increased. The results of these experiments indicate that an emf is induced in a coil of wire whenever there is a change in the magnetic flux interlinking it, and that there is a definite relationship between the direction of the field and the direction of motion and between the magnitude of the induced emf and how rapidly we change the magnetic flux

? = BA cos ? where ? is the angle between the magnetic induction B and the line perpendicular to the area A.

In this case

The motion is in the opposite direction the induced current will also be in the opposite direction

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