A rectangular loop of dimension \( L \) and width \( w \) moves with a constant velocity \( v \) away from an infinitely long straight wire carrying a current \( I \) in the plane of the loop as shown in the figure below. Let \( R \) be the resistance of the loop. What is the current in the loop at the instant the near-side is at a distance \( r \) from the wire?
Consider two, single turn, co-planar, concentric coils of radii \( R_1 \) and \( R_2 \) with \( R_1 \gg R_2 \). The mutual inductance between the two coils is proportional to:
