Consider a blood-flow sensor placed around the artery in Figure P20.92. Assume the arter...

Consider a blood-flow sensor placed around the artery in Figure P20.92. Assume the artery has a radius of 3.0 mm and the magnetic field is B = 0.050 T. (a) If the blood speed is 25 cm/s, what is the magnitude of the electric potential difference across the artery? (b) Which side of the blood vessel in Figure P20.92 is at a positive potential (relative to the other side)? (c) How does the induced electric potential difference across the artery change if the artery is smaller, with r = 0.50 mm? (d) Explain why this type of blood-flow meter is most useful for large arteries.