Force on a Moving Charge: If a calculated quantity has units of T ? m/A, that quantity could be
A. an electric field.
B. an electric potential.
C. ?0.
D. a magnetic field.
E. a magnetic torque.
Answer: C
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In the figure, an airport luggage-carrying train with a tractor T is pulling three luggage carts, src="https://sciemce.com/media/4/dbb7a8fd287d574913.png" class="w-image" />and cart 
and 
with an acceleration of 1.0 
If T = 300 kg, 
= 200 kg, 
= 100 kg, and 
= 100 kg, then the force in the connection between cart 
is
A. 700 N.
B. 400 N.
C. 200 N.
D. 100 N.
E. 0 N.
The fact that a force is exerted on a current-carrying wire when in a magnetic field is employed in _______.
A. motors B. electric meters C. both of these D. neither of these
Sound: Seven seconds after a brilliant flash of lightning, thunder shakes the house. Approximately how far was the lightning strike from the house?
A. much closer than one kilometer B. about one kilometer away C. about two kilometers away D. much farther away than two kilometers E. It is impossible to say.
The two most abundant elements that make up the salinity of seawater are
A) sodium and potassium. B) chlorine and sulfur. C) calcium and sulfur. D) chlorine and sodium.