14. A conducting stick of length L is fixed on a pivot on one end, around which it is free to spin. It spins at a constant rate of three rotations per second. A magnetic field of field strength B is oriented parallel to the axis of rotation (see diagram). X X X X X X X X X OX X X X X X X X X X a) Calculate the potential difference induced between the two ends of the stick in terms of L, B, and numerical constants. (Hint: Faraday, flux swept out.) b) Based on the directions shown in the diagram, which end of the stick will have an overall positive charge, which a negative charge? Explain your answer. X