The drawing shows a type of flow meter that can be used to measure the speed of

Question

The drawing shows a type of flow meter that can be used to measure the speed of blood in situations when a blood vessel is sufficiently exposed (e.g., during surgery). Blood is conductive enough that it can be treated as a moving conductor. When it flows perpendicularly with respect to a magnetic field, as in the drawing, electrodes can be used to measure the small voltage that develops across the vessel. Suppose the speed of the blood is 0.27 m/s and the diameter of the vessel is 5.6 mm. In a 0.69-T magnetic field what is the magnitude of the voltage that is measured with the electrodes in the drawing?

Explanation / Answer

The magnetic force on a charge q will be:

F = qvB = q*0.27*0.69 = q*0.186, so it corresponds to an electric field of 0.186.

The corresponding voltage is thus:

0.186 * 5.6e-3 = 1.0416e-3 (V)

Related Questions

Navigate

• Browse (All)
• Browse T
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.