A metal rod AB, whose resistance unit length is ρ, moves at a constant velocity v perpendicular to AB, closing two ideal conductors OC and OD that form an angle α with each other. The length of OC is l and AB ⊥ OC. Whole system is located in a uniform constant magnetic field of induction B, perpendicular to the plane of the system. Find the total amount of heat that will be released in the chain during the movement of the rod from point O to point C.