# Questions tagged [lenz-law]

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### Back EMF in electromagnetic coil

I am trying to quantify the back EMF generated while actuating an electromagnetic coil, this would be included in a general calculation to estimate the coil output under a variety of conditions. My ...
• 11
72 views

### When a magnetic ball passes through a copper pipe vertically

Let's say a magnetic ball passes through a hollow pipe, which is a conductor (copper), vertically. We can observe that its acceleration is decreased when compared to a free gravitational fall. By ...
118 views

### Can a magnet stop when falling through a copper tube? [closed]

It is known that when a magnet falls through a copper tube, it slows down according to the Lenz's Law. So theoretically if the magnet falls fast enough, can it completely stop for a moment? I have ...
53 views

### Magnetic forces do no wok

The magnetic field is pointing upwards and uniform. Part C: Since the magnetic field does not do any work, the initial velocity of the bar should remain constant through time. But in the solution of ...
1 vote
38 views

### Bar Magnet Falling Through Metal Tube [duplicate]

I'm a bit unsure about the concept of a magnet being dropped through a conductive metal tube. I know that the change in flux will induce eddy currents in the walls of the tube which will resist the ...
• 11
66 views

### Is there a magnetic force acting on a conducting ring falling due to gravity in presence of a uniform magnetic field that exists along $-z$ direction? [closed]

If so, then why? We know that a current carrying closed loop in a uniform magnetic field experiences no force but when it's suddenly pulled by an external force, according to Lenz law a magnetic force ...
33 views

### Does the net induced emf decrease in this case?

In a video from the YouTube channel veritasium about Misconceptions of electricity It is said that energy is mostly of the electric fields produced by the surface charges and battery , which make them ...
• 441
88 views

### Is this a contradiction to Lenz's Law?

I've been really stumped on this particular concept. In Case A, when a bar magnet is brought towards a copper coil around a soft iron core, in accordance with Faraday's Law of Electromagnetic ...
518 views

### If a loop is not complete, and magnetic field passing through it is changing; will their be emf induced in the loop?

In a setup like the one show in the figure: Will there be an induced EMF across the loop(given that the field is increasing)? (my dilemma is : since the loop is not complete, we cannot define the ...
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