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Bengo
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Homework Statement
Can't seem to upload the figure in my workbook so I'll describe it. A metal bar is placed on 2 rails that slope up with a gradually increasing tangent. The bar has a higher conductivity than the rest of the apparatus. The 2 ends of the rails at the bottom are connected to a power supply. In the absence of any external magnetic field, a voltage was applied to produce a current in the loop. The bar gradually climbed the rails until eventually coming to rest. It was assumed that the gravitational force on the bar was equal to the magnetic force generated by the current.
I just want to know why the bar moves. none of the questions in the passage really address it.
Homework Equations
Faraday's law
The Attempt at a Solution
The only force I can think of is the one originating from the magnetic field from the current in the loop in which the metal bar is a part of but I don't think it can act on itself.
I tried to apply lenz's law but there is no External magnetic field to opposeEdit: I guess the attachment did go through