On these problems all i can figure out is which formula to use..after that i am completely lost..I don't really like physics, the whole pick the right formula for the given problem is too confusing for me... Problem 1) I think its Fmag= q*velocity*B*sin(theta) or would it be Fmag= B*I*L(Sin*theta) , but whenever i try to plug in whats given i have 2 unknowns Fmag and B... Problem 2) The only formula i can think of that would solve this problem would be Force/Length= (4(Pi)*10^-7(Ia)(Ib))/2(Pi)d, but once again i have more than one missing variables in the equation. Problem 3) Is I think using Faraday's law, but when i apply it, i cant find some of the missing variables once again to complete the formula.. Problem 4 & 5) I've got the answer already. If anyone could help me figure out how to do these problems it would be greatly appreciated. I know it doesnt look like it, but i've spent an hour or so trying to do these problems and looking through the book trying to find a problem similar to this, but no luck Thanks in advance.