Typical blood velocities in the coronary arteries range from 10.0 to 30.0 cm/s .

Question

Typical blood velocities in the coronary arteries range from 10.0 to 30.0 cm/s . An electromagnetic flowmeter applies a magnetic field of 0.242T to a coronary artery with a blood velocity of 21.1cm/s . As we see in the figure, this field will exert a force on ions in the blood, which will separate. The ions will separate until they make an electric field that exactly balances the magnetic force. This electric field produces a voltage that can be measured.(Figure 1)

Part A

What force is felt by a singly ionized (positive) sodium ion?

Part B

Charges in the blood will separate until they produce an electric field that cancels this magnetic force. What will be the resulting electric field?

Part C

What voltage will this electric field produce across an artery with a diameter of 2mm ?

Explanation / Answer

a. So Force= IqI v B
q=1.6*10^-19 (this is the charge of proton
v is given
B is given
Therefore, |1.6*10^-19|*.211m/s*.242=
ANSWER =8.17

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