Two long, parallel wires carry currents of 4.00 A and 6.00 A. If the distance between the wires is 0.400 m, what is the force per unit length between the wires?
A) 2.00 ?N/m
B) 5.00 ?N/m
C) 12.0 ?N/m
D) 16.0 ?N/m
E) 38.0 ?N/m
C
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Quenching into a saltwater brine produces a _________cooling rate than quenching into oil.
Fill in the blank(s) with the appropriate word(s).
Astronomers now speculate that a galaxy's shape depends on all of the following except
a. the rate of star formation. b. the history of past collisions. c. the mass. d. All of the other choices may be important in determining a galaxy's shape.
A bar magnet is dropped from above and falls through the loop of wire shown below. The north pole of the bar magnet points downward towards the page as it falls. Which statement is correct?
a.
The current in the loop always flows in a clockwise direction.
b.
The current in the loop always flows in a counterclockwise direction.
c.
The current in the loop flows first in a clockwise, then in a counterclockwise direction.
d.
The current in the loop flows first in a counterclockwise, then in a clockwise direction.
e.
No current flows in the loop because both ends of the magnet move through the loop.
How does the resistance of a thick piece of copper wire compare to the resistance of a thin piece of copper wire?
A. The resistance of the thin piece is greater than that of the thick piece. B. The resistance of the thick piece is greater than that of the thin piece. C. Both the wire and narrow piece of copper provide the same resistance.