A conductor of length I and mass m can slide without friction, but with an ideal electrical contact, along two vertical conductors AB and CD connected through a capacitor (Fig. 30.2). Perpendicular to the plane of the figure a uniform magnetic held of induction B is set up. Find the voltage across the capacilor plates as a function of h.

Answer

`triangle phi=epsi=Bl sqrt(2g(H-h))`.