I have two wires, each 1 meter in length. They are at a parallel distances (d) of 5cm from each other. I send a current through one wire: I1 = 2 amps, and what I want to find is the current induced on the other wire: I2 = ? I can find B with the following formula (given a radius - which I could substitute with d): B = μ0I/2πr For a transformer, I could find I2 using the following formula: Ip = Is(Ns / Np) (Where Ip is the primary current, Is is the secondary current, Ns is the number of loops for the secondary coil, and Np the number of loops for the primary coil) However, the transformers I know, all use a core of some sort - which will stretch the magnetic field. Through my hours of searching, I have come across this formula: ΔF = ΔL(μ0 I1 I2 / 2 π d). I could solve for I2 but ΔF is still unknown here - I guess I could ask 'How do I find ΔF?,' never the less, perhaps there is yet another formula I'm missing out on? I would like to know of a formula such as: I = f(B, v) where B is a force from say a permanent magnet, moving at a constant speed of v.