A small region of space contains a magnetic field directed into the page as show

Question

A small region of space contains a magnetic field directed into the page as shown. There is no magnetic field anywhere else. A loop of wire is initially outside the field, travels through the field in the direction shown, and exits the far side of the field area. For each of the parts of this trip given, give both the direction of the induced current in the coil and a justification for your answer. If there is no justification there will be no point awarded!! What is the direction of the induced current when the loop is entering the field, but part of the loop is still outside that region? What is the direction of the induced current when the loop is completely in the field, still moving in the direction shown? What is the direction of the induced current when the loop is leaving the field, but there is still a field in part of the loop?

Explanation / Answer

When there is a change in flux, there will be emf induced and as a result induced current will develop and the direction of induced current will always oppose the cause due to which it has produced.

So 15) when loop will enter into the magnetic field, it's flux will start increasing so current will be induced in such a way so that flux in the loop will decrease and hence current in the loop will be counterclockwise so that the net magnetic field inside the loop will decrease and the flux will also decrease.

16) when loop will completely enter in the magnetic field, there will not be any change in the flux and so there will not be any induced current in the loop.

17) when the loop will start coming out of the magnetic field, flux will start decreasing so current will be induced in clockwise direction so that net magentic field will increase and hence flux will increase.

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