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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.
- #2
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.
Neglect gravity other than that of water; neglect friction.
F1=ρgsh=1000*10*1*(1+4)=50000 N;
F1=ρgsh=1000*10*0.1*4=4000 N;
F3=50000-4000=46000 N?
Starting with the mass considerations #m(t)# is mass of water #M_{c}# mass of container and #M(t)# mass of total system
$$M(t) = M_{C} + m(t)$$
$$\Rightarrow \frac{dM(t)}{dt} = \frac{dm(t)}{dt}$$
$$P_i = Mv + u \, dm$$
$$P_f = (M + dm)(v + dv)$$
$$\Delta P = M \, dv + (v - u) \, dm$$
$$F = \frac{dP}{dt} = M \frac{dv}{dt} + (v - u) \frac{dm}{dt}$$
$$F = u \frac{dm}{dt} = \rho A u^2$$
from conservation of momentum , the cannon recoils with the same force which it applies.
$$\quad \frac{dm}{dt}...
I was told forces are vectors so they can be divided into x and y components, but what about the normal force or the force of static friction? do you divide those into x and y components if say you had a block that was lying on an angled surface?
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