1. The problem statement, all variables and given/known data Two long rods with distance between them a=100mm, over those two rods there's another rod sliding, friction between them is negligible. The rods are placed in homogenous magnetic field whose B is equal 1T, with direction shown in the picture, between the rods there is voltage generator with constant E, and resistance R=0,1Ω. When mechanical force on rod is zero, then, velocity of rod is v0=10m/s. Represent power of this engine in function of the velocity of the rod and find the mechanical force that acts when power of this engine is strongest, and find that power. Ignore the self-inductance (i believe self-inductance is the correct term). 2. Relevant equations eind=∫(v×B)dl 3. The attempt at a solution When there's no mechanical force, then there's only magnetic force due to generator E, but i don't know how to express power using velocity and how can i express it if i don't know is there mechanical force (it says at first that if there's no mechanical force then v is known), i mean is mechanical force important for finding power of the eind "generator" and how can i find the expression wanted?