If air were a better conductor, at nighttime Earth would be
A) considerably colder.
B) considerably warmer.
C) not appreciably different in temperature.
Answer: A
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An electric field is produced by a
A) constant magnetic field. B) changing magnetic field. C) either a constant or a changing magnetic field. D) none of the given answers
An object is moving with constant non-zero velocity in the +x direction. The velocity versus time graph of this object is
A) a horizontal straight line. B) a vertical straight line. C) a straight line making an angle with the time axis. D) a parabolic curve.
What current is flowing in a resistor if 4.0 × 1016 electrons pass a point in the resistor in 0.50 s? (e = 1.60 × 10-19 C)
A) 0.013 A B) 78 A C) 0.31 A D) 6.3 A
An electron which moves with a speed of 7.5 × 10^3 m/s parallel to a uniform magnetic field of 0.40 T experiences a force of what magnitude? (e = 1.6 × 10^-19 C)
a. 1.9 × 10^-15 N c. 2.2 × 10^-24 N b. zero d. 4.8 × 10^-14 N