by phibins on December 11th, 2011

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A bar magnet is fired horizontally through a conductive loop?

I am having trouble with this one, i would appreciate some help from the AB community.

The induced current would change directions as the magnet came out of the far side. - 0% (no votes) 0%

The Induced magnetic field would act to repulse the magnet on both its approch and exit, thereby conserving energy - 100% (2 votes) 100%

Exponentially increasing magnetic flux would prevent the bar magnet from passing through the loop. - 0% (no votes) 0%

The induced current would be the same as if the magnet were first moved towards the ring, and then moved away . The fact that it passed through the loop is irrelevant. - 0% (no votes) 0%

both options #1 and #4 - 0% (no votes) 0%

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by engineer is Terminator on December 12th, 2011
voted: The Induced magnetic field would act to repulse the magnet on both its approch and exit, thereby conserving energy
This is a very famous law in electromagnetic theory, called the Lenz's law, by virtue of which the induced magnetic field always opposed the source inducing the change.So, it works on action reaction principle and hence, energy is conserved.
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