The magnetic circuit shown in Figure P18.35 is a very simplified representation of devices used as surface roughness sensors. The stylus is in contact with the surface and causes the plunger to move along with the surface. Assume that the flux ? in the gap is given by the expression ? = ? (x), where ? is a known constant and (x) is the reluctance of the gap. The emf e is measured to determine the surface profile. Derive an expression for the displacement x as a function of the various parameters of the magnetic circuit and of the measured emf. (Assume a frictionless contact between the moving plunger and the magnetic structure and that the plunger is restrained to vertical motion only. The cross-sectional area of the plunger is A.)
Analysis:
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Answer the following statement(s) true (T) or false (F)
1. Engineers may express publicly technical opinions that are founded upon knowledge of the facts and competence in the subject matter. 2. Engineers may accept assignments and assume responsibility for coordination of an entire project and shall sign and seal the engineering documents for the entire project, including each technical segment of the plans and documents. 3. Engineers shall issue no statements, criticisms, or arguments on technical matters that are inspired or paid for by interested parties, unless they have prefaced their comments by explicitly identifying the interested parties on whose behalf they are speaking, and by revealing the existence of any interest the engineers may have in the matters. 4. Engineers shall not accept compensation, financial or otherwise, from more than one party for services on the same project, or for services pertaining to the same project, unless the circumstances are fully disclosed and agreed to by all interested parties.
Equations are used to solve problems where one or more quantities are not known.
Answer the following statement true (T) or false (F)
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