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Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Please answer these three questions. Thank you!

A material has a Poisson’s ratio of -0.2 . Which of the following is true?

a. Strain is always compressive regardless of the force applied.

b. Lateral and longitudinal strains will have the same sign

c. Lateral strain is five times the longitudinal strain.

d. The material is ductile and has a high modulus of elasticity.

Consider a rod that can carry a maximum stress equal to 200 MPa. If it is to be designed to have a factor of safety against failure equal to 1.5, then the maximum stress that the rod should experience when loaded is nearest to ______

a. 133 MPa

b. 150 MPa

c. 300 MPa

d. 267 MPa

Which of the following statements is FALSE?

A. The modulus of elasticity of a material can vary between axes.

B. The modulus of rigidity can be determined from the shear stress-strain diagram.

C. The Poisson’s Ratio can be used in calculating the new diameter in the Necking Region of the stress strain diagram.

D. Most materials exhibit a contraction in lateral dimension when subjected to elongation in the longitudinal dimension.

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