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Homework Statement
A wire lies at height z=h carrying current parallel to the y-axis. A square loop, of side length b, is moving in the direction of +x with a velocity v. Find the magnitude of the emf at the moment when the center of the loop crosses the y-axis.
Homework Equations
The Attempt at a Solution
Would the fact that the B-field makes circle around the wires mean that flux through the loop is 0 at this moment? I need to find d(Flux)/dt, but that seems like it would be quite a complicated function! Is there a trick that keeps me from having to do that?
Otherwise, perhaps I would find the z-component of B-field, but that wouldn't involve any dependence on t... so how do I get the t into the equation so that the derivative of my expression for flux is not 0? (If there is no t in the expression, d(anything)/dt is 0...)