What is the direction of 
at point P?
A. A
B. B
C. C
D. D
E. E
F. F
T. Zero
B. B
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Which of the following is(are) found mainly between Mars and Jupiter?
a. Asteroids b. Meteoroids c. Comets d. Interplanetary dust
We find that 2N current loops are coplanar and coaxial. The first has radius a and current I. The second has radius 2a and current 2I, and the pattern is repeated up to the Nth, which has radius Na and current NI. The current in the loops alternates in direction from loop to loop as seen from above. Thus the current in the first loop is counterclockwise, in the next clockwise, up to the last loop where it is again clockwise. The magnitude of the magnetic field at the center of the loops is
A.
B.
.C.
.D.
.E.
.Equilibrium: A 10-kg sign is held by two ropes as shown in the figure. What is the tension on rope A?
A. 44 N B. 69 N C. 72 N D. 88 N E. 98 N
Silver solder
(a) At what temperature does the first solid form, and what is the chemical composition of this first solid to form?
(b) At what temperature does the alloy completely transform to a solid; what phases are present after the alloy is completely solid, and what are their chemical compositions at the transformation temperature?
(c) At room temperature, what is the atom fraction of each phase present?