- #1
Ylle
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Homework Statement
Two infinite long straight conductors and a rectangular circuit lies in the same plane. The straight conductors is parallel and got the distance 2a from each other. There runs a constant current of I1 and I2 in both of them, and the current is pointed downwards. The rectangular circuit is placed in between the two conductors and got the resistance R. The circuit got the sidelengths a and b, where the side b is parallel with the straight conductors. The sidelength a is constant. The sidelength b grows as a function of time t in the interval 0 < t < [tex]\tau[/tex] which is:
b(t) = a((1+3(t/[tex]\tau[/tex])^2)-(2(t/[tex]\tau[/tex])^3)),
where tau is a timeconstant.
For t < 0, b = a
For t > [tex]\tau[/tex], b = 2a
The magneticfields produced by the current in the straight conductors gives a magnetic flux through the rectangular circuit of:
[tex]\Phi[/tex]B = K * b(t),
where K is a constant.
Determine the constant K. The answer must be expressesd in terms of [tex]\mu[/tex]0 and the currents I1 and I2
Homework Equations
Dunno
The Attempt at a Solution
I know the answer is: K = [tex]\mu[/tex](I2-I1)(ln(3)/(2*pi)), but I have no idea how to get there.
I've tried with Faradays Law, but I couldn't get it there either.
So, I just need a clue what to do actually :)
Regards