### Subject: maglev - the em drag between a moving conductor and a magnet

Date: **Sat Apr 30 13:27:00 2005**

Posted by **abdul**

Grade level: **teacher/prof**
School: **sam tet**

City: **Ipoh** State/Province: **Perak**
Country: **Malaysia**

Area of science: **Physics**

ID: **1114885620.Ph**

**Message:**

I am doing a STUDY of EM drag force between a moving conductor and a permanent
magnet. I understand that a conductor moving with a velocity v over a permanent
magnet will experience a REPULSIVE force. The formula for that force is as
follows:
Lift force = (Mu*I*I/4*pi*h)(v*v/(v*v + w*w))
Drag Force = (w/v)*Lift Force
w=2/(mu*sigma*delta)
Mu = magnetic permeabilty of vacum
I = Current generated in conductor
h = separation between permagnet and conductor
v = velocity of conductor
w = charateristic velocity
sigma = conductivity of conductor
delta = conductor thickness.
w = The velocity where the EM DRAG is maximum
w=2/(mu*sigma*delta)
The formula shows that the charateristic velocity varies inversley with the
thickness of the conductor. This means:
1. If thickness approaches ZERO w approaches infinity!
2. If thickness approaches infinity w approaches zero!
Are these deductions correct.? What part does the EDDY CURRENT penetration
depth plays in this?

Re: maglev - the em drag between a moving conductor and a magnet

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