A rectangular coil, with corners labeled ABCD, of length L and width w is placed in a magnetic field B as shown in Figure 27-6. If there is a current I flowing through this coil, what is the force acting on section AB of this coil?
A)
ILB sin?
B)
ILB cos ?
C)
ILB
D)
0 N
E)
ILB/2
C
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A steel pipe column (E 5 210 GPa) with length L 5 4.25 m is constructed of circular tubing with outside diameter d2 5 90 mm and inner diameter d1 5 64 mm. The pipe column is fixed at the base and pinned at the top and may buckle in any direction. The Euler buckling load of the column is most nearly:
(A) 303 kN
(B) 560 kN
(C) 690 kN
(D) 720 kN
The protons, neutrons, and electrons of our atoms were made in the quark epoch
Indicate whether the statement is true or false
When a superconductor's temperature drops below the critical temperature, its resistance:
a. equals that of a semiconductor of equal dimensions. b. increases by two. c. drops to zero. d. reduces to one half.
The percentage by mass of chlorine
a. would be the same in FeCl3 as in FeCl2. b. would be greater in FeCl3 than in FeCl2. c. would be less in FeCl3 than in FeCl2. d. cannot be determined without additional information.