A nonmechanical water meter could use the Hall effect by app

A nonmechanical water meter could use the Hall effect by applying a magnetic field across a metal pipe and measuring the Hall voltage created.

A.) What is the average velocity in m/s for a 4.75 cm diameter pipe, if a 0.45 T field across it creates a 60.0 mV Hall voltage?

(Please bold answer)

Solution

Hall Voltage is given by

E=BLV

=>V=E/BL =(60*10^-3)/(0.0475*0.45)

V=2.81 m/s