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Homework Statement
I am using these variables:
L for the square length - so the rectangle on the left is L/2 by L
B' = rate at which field increases
λ = Resistance/Length
I1 = Current on the right (so the top/right/bottom of square) - goes counterclockwise
I2 = Current on the left (so the far left and the top/bottom on the little rectangle piece) - counterclockwise
I3 = current through the middle wire (what the question is asking for) - unknown direction, I assumed downwards
Homework Equations
V = IR
Induced emf = derivative of flux
flux = ∫ B dA
The Attempt at a Solution
I have tried setting up loop-rule equations and then just using matrices to calculate the values of I.Loop rule for the square:V = B' * L2 = I1 * 3Lλ + I3 * Lλ
Loop rule for the whole outer rectangle
V = B' * 1.5 * L2 = I1 * 3Lλ + I2 * 2Lλ
Loop rule for the left rectangle:
V = B' * .5 * L2 = I2 * 2Lλ + I3 * Lλ
Using the sum of currents in = sum of currents out
I1 = I2 + I3So I got 4 equations. I remember from non-magnetic field type circuit analysis questions with 3 unknown currents I had to use 2 voltage equations + sum of current equations, because the 3 voltage equations would not give enough information to solve the system. My guess is that any 2 voltage equations and the current equation would be all I need.I am getting the wrong answer with this set-up. Is there an error with my equations, or is this the completely wrong approach?
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