1. The problem statement, all variables and given/known data Faraday's disk with radius of axle r1 and radius of disc r2 is shown in the picture below. Disc rotates in the homogenous magnetic field whose vector B is vertical to the disc. If disc is spinning 1000 rpm find induced voltage between r1 and r2 and what is maximal value of current through the resistor. Known values are: B=1T, r1=1cm, r2=20cm and R=10 Ω. 2. Relevant equations eind=∫(v×B)dl 3. The attempt at a solution Eind=v×B=vBsin(v,B) if there's 1000 rpm that is 16.7 rps and that is what i don't know, what to do next?