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Magnetic Effects -Quiz In part ll of the experiment, you will move a permanent magnet into a coil and measure the induced current (see Figure 292 in the book). If you find a positive current when you bring the north pole of the magnet closer, what do you expect to find when you pull the magnet back? apositive current. O a negative current.


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Answer #1

When the magnet is stationary, there is no current in the coil. However, if we move the magnet towards the coil, the ammeter flicks to the right. Now let's pull the magnet out. The coil flicks to the left.

When the north pole of our magnet is moving towards the left hand end of the coil, the induced current flows anticlockwise (as we look at the left hand end). This makes the left hand end of the coil into a north pole. And this north pole tries to repel the incoming north pole of the magnet.

So the induced current opposes the motion that induced it (from Lenz's Law).

When we pull the magnet out, the left hand end of the coil becomes a south pole (to try and hold the magnet back). Therefore the induced current must be flowing clockwise.

So, we will be getting a negative current when we pull the magnet back.

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