An Electromagnetic Flowmeter Is Useful When It Is Desirable Not $$V = 2.88 \mathrm { mV }$$

question 63

Multiple Choice

An electromagnetic flowmeter is useful when it is desirable not to interrupt the system in which the fluid is flowing (such as the blood in an artery during heart surgery) . Such a device is illustrated in the figure. The conducting fluid moves with speed v in a tube of diameter d. Perpendicular to this tube is a magnetic field B. A voltage V is induced between opposite sides of the tube due to the motion of the conducting fluid in the magnetic field. For a certain case, B = 0.120 T, d = 1.2 cm, and the measured voltage is $$V = 2.88 \mathrm { mV }$$ Determine the speed of the fluid.

• A)2.0 m/s
• B)11 m/s
• C)0.075 m/s
• D)1.1 m/s
• E)750 m/s

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Definitions:

Positive Punishment

A concept in behaviorism where an undesirable behavior is followed by an unfavorable outcome or stimulus, with the intention of decreasing that behavior.

Negative Reinforcement

A behavioral principle where the removal of an unpleasant stimulus strengthens a behavior or increases its likelihood of being repeated.

Nagging

Persistently annoying or finding fault with someone, often to persuade them to do something.

Clean Room

A controlled environment with a low level of pollutants such as dust, airborne microbes, aerosol particles, and chemical vapors, used in scientific research and manufacturing.