Electric dipoles always consist of two charges that are
A)
equal in magnitude; opposite in sign.
B)
equal in magnitude; both are negative.
C)
equal in magnitude; both are positive.
D)
unequal in magnitude; opposite in sign.
E)
unequal in magnitude; both are negative.
A
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A composite beam is made up of a 90 mm 5 160 mm wood beam (Ew 5 11 GPa) and a steel bottom cover plate (90 mm 3 8 mm, Es 5 190 GPa). Allowable stresses in wood and steel are 6.5 MPa and 110 MPa, respectively. The allowable bending moment about the z axis of the composite beam is most nearly:
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