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brianll
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I am having trouble understanding how the right hand rule works with lenz's law. Please explain
How do Lenz's Law and the right hand rule work together in electromagnetism?
- Thread starter brianll
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- hand Law Lenz Lenz law Right hand rule
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Lenz's Law describes how an induced current in a conductor opposes changes in magnetic flux, illustrated by a magnet falling slowly through a copper pipe due to induced currents. The right-hand rule helps determine the direction of the induced current and force in these scenarios. A demonstration with a suspended copper pipe shows that when a magnet is pulled away, the pipe moves in response, illustrating Lenz's Law in action. Understanding whether magnetic flux is increasing or decreasing is crucial, but in this case, the flux from a permanent magnet remains constant. The discussion emphasizes the interplay between Lenz's Law and the right-hand rule in electromagnetism.
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Delphi51
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Welcome to PF, brian. Lenz's law is an interesting and useful shortcut for working out the direction of a force. The hand rule is the basic and longer way to work out many of these situations. There isn't much more to be said unless you are interested in a specific situation.
The classic demo for Lenz' law is dropping a strong magnet through a copper pipe. It falls s l o w l y. Lenz' law says the magnetism induces a current in the pipe which acts to oppose the motion of the magnet.
A similar apparatus has a piece of copper pipe suspended by threads so it is free to move. When you pull the magnet out, Lenz' law says the copper pipe tries to hold on to the magnet and you can see this because the magnet pulls back on the pipe and makes it move. Here is the explanation of that effect using the hand rule:
The classic demo for Lenz' law is dropping a strong magnet through a copper pipe. It falls s l o w l y. Lenz' law says the magnetism induces a current in the pipe which acts to oppose the motion of the magnet.
A similar apparatus has a piece of copper pipe suspended by threads so it is free to move. When you pull the magnet out, Lenz' law says the copper pipe tries to hold on to the magnet and you can see this because the magnet pulls back on the pipe and makes it move. Here is the explanation of that effect using the hand rule:
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brianll
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Hi Delphi. How do you figure out if the magnetic flux is increasing or decreasing?
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Delphi51
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In the example, the magnetic flux is from a permanent magnet and is constant.
In this question, I have a question. I am NOT trying to solve it, but it is just a conceptual question.
Consider the point on the rod, which connects the string and the rod. My question: just before and after the collision, is ANGULAR momentum CONSERVED about this point?
Lets call the point which connects the string and rod as P.
Why am I asking this? : it is clear from the scenario that the point of concern, which connects the string and the rod, moves in a circular path due to the string...
This problem is two parts. The first is to determine what effects are being provided by each of the elements - 1) the window panes; 2) the asphalt surface. My answer to that is
The second part of the problem is exactly why you get this affect.
And one more spoiler:
Let's declare that for the cylinder,
mass = M = 10 kg
Radius = R = 4 m
For the wall and the floor,
Friction coeff = ##\mu## = 0.5
For the hanging mass,
mass = m = 11 kg
First, we divide the force according to their respective plane (x and y thing, correct me if I'm wrong) and according to which, cylinder or the hanging mass, they're working on.
Force on the hanging mass
$$mg - T = ma$$
Force(Cylinder) on y
$$N_f + f_w - Mg = 0$$
Force(Cylinder) on x
$$T + f_f - N_w = Ma$$
There's also...
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