1. The problem statement, all variables and given/known data A metal bar of length 1.3 m and mass 0.04 kg slides with negligible friction but with good electrical contact down between two vertical metal posts. After speeding up initially, the bar falls at a constant speed (zero acceleration). The falling bar and the vertical metal posts have posts have negligible electrical resistance, but the bottom rod is a resistor with resistance 26 ohms. Throughout the entire region there is a uniform magnetic field of magnitude 1.5 tesla coming straight out of the page. Find the constant speed at which the bar falls. v = ____ m/s 2. Relevant equations Fgrav=mg Fmag=I*(deltaL X B) deltaV=I*R 3. The attempt at a solution I know that Fgrav = 0.04* 9.8 = 0.392, and this must be equal and opposite to Fmag. The logic behind this is that the bar eventually falls at a constant speed, meaning there is no net force acting upon it. Therefore, I do 0.392 = I *(1.3 * 1.5) I = 0.2 Using the current, I can find the change in voltage by 0.2 * 26 = 5.2 V. This is where I am getting confused, is there any way to readily convert from volts to the velocity? I feel that I have all the necessary information, but could anyone let me know if I am wrong? Thanks!