A wire of length 2m and mass 20g is help horizontally. It has a current running through it. You have a second identical 2m long wire that you want to "float" 1cm below this wire. a. How much current would you need in each wire (assume you have the same current through both wires) and in what direction? b. If you wanted to float the second wire ABOVE the first one, what would you change? a. I am thinking I would use the equation B = (m_0*I)/2pi*r but I do not know what B is. I can get force from F=ma but I can not move on from that either.