Parallel Wires: Two long, parallel wires carry currents of different magnitudes. If the current in one of the wires is doubled and the current in the other wire is halved, what happens to the magnitude of the magnetic force that each wire exerts on the other?
A. It is doubled.
B. It stays the same.
C. It is tripled.
D. It is quadrupled.
E. It is reduced by a factor of two.
Answer: B
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Exhibit 14-1
A square of side 
is removed from one corner of a square sandwich that has sides of length L. The center of mass of the remainder of the sandwich moves from C to C'.
?
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Use this exhibit to answer the following question(s).
Refer to . The displacement of the y coordinate of the center of mass (from C to C') is
A.
.B.
.C.
.D.
.E.
.Why couldn't you use an electric motor to turn an electrical generator that in turn provides the electrical energy for the motor?
A. Yes, you can do this B. No energy converter is 100% efficient C. Motors require AC and generators produce DC
Components: If a vector pointing upward has a positive magnitude, a vector pointing downward has a negative magnitude.
A. True B. False
Determine the heat transfer and fin efficiency for a copper fin shown in Figure 2-72. The fin can be assumed to be very long and its base temperature taken as 200ºF.
