1. The problem statement, all variables and given/known data A parallel plate capacitor having plate area equal to A and the separation between the plates equal to d, is placed in a stream of conducting liquid with resistivity r. The liquid moves with constant velocity v parallel to the plates of capacitor. The complete system is placed in a uniform magnetic field of induction B, which is parallel to the plates of capacitor and perpendicular to direction of motion of liquid. The plates of capacitor are joined by some external resistance R. Calculate the amount of power generated in that resistance. What is the highest power equal to? 3. The attempt at a solution Since power is being generated, current must be flowing in the circuit. But I don't have any idea what is the source of current here? I know this is somehow related to the flowing liquid but just can't figure out what's going on here. Any hints?