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.

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0000 222 No Magnetic field into magnetic field page х х E + +++ ++ +++++| + +- + + х х х * х Figure P20.92 Problems 92 and 93.