Hello This is a section from a textbook... "an ampere is defined as that current in each of 2 infintely long parallel wires 1 m apart that causes an electromagnetic force of 2 x 10^-7 per meter of its length to act on each wire" Hmmm... was that in English ? q1. So say we start at 0. After 1 meter, wire 1 will cause a force of 2 x 10^-7 N (Is it in Newtons?) on wire 2. That would mean that after 2 meters, wire 1 will cause a force of 2( 2 x 10^-7) N of force on wire 2... and so on. Is that what that passage is trying to say? If so... what does that have to do with anything? Considering we learnt that an amp is basically the number of electrons flowing past a given point per second.