Bar moving in a magnetic field.

  • Thread starter DannyBoy27
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  • #1
I have attached a copy of the question I am having issues with, I can't seem to figure out the equation I have to use to solve this. My lecturer did an example of this but for some reason I can't find it anywhere.
 

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  • #2
Simon Bridge
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If you cannot figure out the equation - use physics instead, and derive the equation.
What is happening, mechanically and electrically, in the problem?
What sort of law will apply here?
 
  • #3
I think I solved the problem. Emf = BLV. And we know that emf will be equal to IR when the current is 0.5A.

0.5 x 9 = 4 x 1.2 x V

Therefore the velocity equals 0.9375 m/s.

Is this correct?
 
  • #5
rude man
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I think I solved the problem. Emf = BLV. And we know that emf will be equal to IR when the current is 0.5A.

0.5 x 9 = 4 x 1.2 x V

Therefore the velocity equals 0.9375 m/s.

Is this correct?

Yes.
Good.
Using Blv works even when Maxwell's equations don't!
 

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