Lenz's Law Video Lessons

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Problem: A bar magnet is dropped through a vertical copper tube and is observed to fall very slowly, despite the fact that mechanical friction between the magnet and the tube is negligible.  Which of following best explains the reason for this? A. The falling magnet magnetizes the copper pipe which causes the now permanent copper pipe magnet to attract the falling magnet thus causing the slower descent. B. The falling magnet is slowed by the Earth’s magnetic field. C. The changing flux of the falling magnet induces a magnetic field in the copper pipe, in the opposite direction of the bar magnet's field, which impedes the movement through the pipe. D. Friction and Air resistance cause the magnet to fall much slower than it would outside of the tube.

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Problem Details

A bar magnet is dropped through a vertical copper tube and is observed to fall very slowly, despite the fact that mechanical friction between the magnet and the tube is negligible.  Which of following best explains the reason for this?

A. The falling magnet magnetizes the copper pipe which causes the now permanent copper pipe magnet to attract the falling magnet thus causing the slower descent.

B. The falling magnet is slowed by the Earth’s magnetic field.

C. The changing flux of the falling magnet induces a magnetic field in the copper pipe, in the opposite direction of the bar magnet's field, which impedes the movement through the pipe.

D. Friction and Air resistance cause the magnet to fall much slower than it would outside of the tube.

Frequently Asked Questions

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Lenz's Law concept. You can view video lessons to learn Lenz's Law. Or if you need more Lenz's Law practice, you can also practice Lenz's Law practice problems.

How long does this problem take to solve?

Our expert Physics tutor, Juan took 2 minutes and 41 seconds to solve this problem. You can follow their steps in the video explanation above.

What professor is this problem relevant for?

Based on our data, we think this problem is relevant for Professor Urbanc's class at DREXEL.