Current produced by varying magnetic flux

AI Thread Summary
The problem involves calculating the current generated by a changing magnetic flux in a system with two circular circumferences of different radii and a specific resistance per meter. The magnetic field change rate is given as 2.00 T/s, and the resistance is 3.00 ohm/meter. The electromotive force (EMF) can be calculated using the formula EMF = -N (dΦ_B/dt), where N represents the number of turns, and the current can be derived from Ohm's law, V = RI. The current will flow in a direction that opposes the change in magnetic flux, according to Lenz's law. Understanding these principles is essential for solving the problem accurately.
Tosh5457
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I'm translating the problem, so sorry for the errors.

Homework Statement


Radius of the upper circumference = 5cm
Radius of the lower circumference = 9cm
Resistance/meter = 3.00 ohm/meter
B is the magnetic field: DB/dt = 2.00 T/s

What's the magnitude of the current, and where does the current points to?

Homework Equations



EMF = -N \ \frac{\Delta \Phi_B}{\Delta t} \ \ \mbox{or} \ \ -N \ \frac{d\Phi_B }{dt}
V = RI

The Attempt at a Solution

 

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Well, find the magnetic flux from the external field; the current should be produced in order to oppose an change in magnetic flux.
 

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