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PH 122 (46)
Lecture

# Electromagnetic flowmeter, torque on dipoles, MRI

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Department
Physics
Course
PH 122
Professor
Brian Jones
Semester
Spring

Description
7 March Parallel currents attract, opposite currents repel The Electromagnetic Flowmeter The probe’s magnets apply a strong field. The electrodes make contact along an axis perpendicular to this field. The magnetic field exerts forces on ions moving with the blood. Positive and negative ions feel forces in opposite directions. These forces create a separation of charge, producing a potential difference between the electrodes. If the flow is north at 3.5 m/s, the field is tipped at a 60° angle, and an investigator places two electrodes 10 m apart, on an east-west axis, what is the measured voltage? B y 50μT sin 60° qE = qvB E = vB E = (3.5 m/s) (50 μT sin 60°) E = 1.5 x 10 V/m ΔV = EΔd = (1.5 x 10 V/m) (10 m) = 1.5
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