Consider a straight infinite wire that carries a current I. Suppose you place a square circuit near the wire such that the circuit and the wire lie on the same plane. The length of the sides of the circuit is l`. The nearest side of the rectangle is at a distance d from the wire. question is that; What is the magnetic flux that goes through the circuit? and If the current in the infinite wire is changing constantly, i.e dI/ dt = c = constant, what is the current running in the circuit? any idea? thanks your attention..