Typical blood velocities in the coronary arteries range from 10 to 30 cm/s. An electromagnetic flowmeter applies a magnetic field of 0.25 T to a coronary artery with a blood velocity of 15 cm/s. As we saw in Figure 24.36, this field exerts 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. a. What force is felt by a singly ionized (positive) sodium ion? 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? c. What voltage will this electric field produce across an artery with a diameter of 3.0 mm?
Typical blood velocities in the coronary arteries range from 10 to 30 cm/s. An electromagnetic flowmeter applies a magnetic field of 0.25 T to a coronary artery with a blood velocity of 15 cm/s. As we saw in Figure 24.36, this field exerts 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. a. What force is felt by a singly ionized (positive) sodium ion? 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? c. What voltage will this electric field produce across an artery with a diameter of 3.0 mm?
Typical blood velocities in the coronary arteries range from 10 to 30 cm/s. An electromagnetic flowmeter applies a magnetic field of 0.25 T to a coronary artery with a blood velocity of 15 cm/s. As we saw in Figure 24.36, this field exerts 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.
a. What force is felt by a singly ionized (positive) sodium ion?
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?
c. What voltage will this electric field produce across an artery with a diameter of 3.0 mm?
Interaction between an electric field and a magnetic field.
Draw the velocity vectors starting at the black dots and the acceleration vectors including those equal to zero.
You toss a ball straight up by giving it an initial upward velocity of 18 m/s. What is the velocity of the ball 0.50 s after you released it? Define the positive y direction to be upward,
the direction that you toss the ball.
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Two springs are arranged in series, and the whole arrangement is pulled a vertical distance of 2
cm. If the force in Spring A is 10 N, what is the force in Spring B as a result of the
displacement?
05N
5 N
0.2 N
10 N
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Chapter 24 Solutions
College Physics: A Strategic Approach (3rd Edition)
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