A capacitor consisting of two separated parallel horizontal plates has a uniform electric field directed upward. If a negative charge is placed exactly midway between the two plates, it will
A. be accelerated to the right.
B. be accelerated to the left.
C. remain at rest.
D. be accelerated downward.
E. be accelerated upward.
Answer: D
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For a star like the Sun, the gravitational collapse of the interstellar cloud lasted for about ________ and stopped with the ignition of the fusion reaction.
A. 1-10 million years B. 100 million years C. 5-10 billion years D. 1 billion years E. 50-100 billion years
An electron moving in the positive x direction experiences a magnetic force in the positive z direction. If Bx = 0, what is the direction of the magnetic field?
A. negative y direction B. positive y direction C. negative z direction D. positive z direction E. negative x direction
Torque: Which of the following are units for the magnetic moment? (There could be more than one correct choice.)
A. 
B. A ? m2
C. N ? m/T
D. T/m2
Star A and Star B have same temperatures, but Star A is more luminous than Star B. Based on this information, which of the following must be the case?
A. Star A is larger than Star B. B. Star A is smaller than Star B. C. Star A and Star B have same size. D. Star A is more massive than Star B.