Solution :
Here we have :
Diameter of artery : d = 2 mm = 2 x 10-3 m
Magnetic field : B = 0.5 T
And, Hall Voltage : Vhall = 5 mV = 5 x 10-3 V
.
Since, Hall Voltage is given by : Vhall = v B d
Where, v is the average velocity of the fluid.
∴ (5 x 10-3 V) = v (0.5 T)(2 x 10-3 m)
∴ v = 5 m/s
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