If the voltage between the plates of a parallel-plate capacitor is doubled, the charge on the capacitor
A)
is tripled.
B)
is doubled.
C)
is halved.
D)
quadruples.
E)
remains the same.
B
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If the frequency of the AC voltage across a capacitor is doubled, the capacitive reactance of that capacitor
A) decreases to one-fourth its original value. B) increases to 4 times its original value. C) decreases to one-half its original value. D) becomes zero. E) increases to twice its original value.
Multiple-Object Accelerating Systems: Three boxes are pulled along a horizontal frictionless floor by a constant horizontal pull P. The boxes are connected by very light horizontal strings having tensions T1 and T2 as shown in the figure. Which of the following statements about the tensions is correct? (There could be more than one correct choice.)
A. T1 = P B. T2 = P C. T1 + T2 = P D. T2 > T1 E. T1 > T2
A proton with a kinetic energy of 0.20 keV follows a circular path in a region where the magnetic field is uniform and has a magnitude of 60 mT. What is the radius of this path?
a. 4.1 cm b. 2.9 cm c. 3.4 cm d. 5.1 cm e. 2.4 cm
A light ray in air strikes a glass surface with an angle of incidence of
The angle of refraction in the glass is 
What is the angle between the reflected ray and the refracted ray?
A. 
B. 
C. 
D. 
E. 