The critical angle for an air-glass interface is 10.9 degrees. A ray in air is incident on the interface. The reflected ray is 100 percent polarized. The angle of refraction is closest to:
A) 10.7°
B) 10.1°
C) 9.51°
D) 8.91°
E) 8.31°
A
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An uncharged conductor has a hollow cavity inside of it. Within this cavity there is a charge of +10 µC that does not touch the conductor. There are no other charges in the vicinity. Which statement about this conductor is true?
(There may be more than one correct choice.) A) The inner surface of the conductor carries a charge of -10 µC and its outer surface carries no excess charge. B) The inner and outer surfaces of the conductor each contain charges of -5 µC. C) The net electric field within the material of the conductor points away from the +10 µC charge. D) The outer surface of the conductor contains +10 µC of charge and the inner surface contains -10 µC. E) Both surfaces of the conductor carry no excess charge because the conductor is uncharged.
At a distance of 10 m from a light bulb the rms value of the electric field is 16 V/m. What is the rms value of the electric field at a distance of 20 m from the light bulb?
A. 32 V/m B. 16 V/m C. 8.0 V/m D. 4.0 V/m E. 2.0 V/m
If the magnetic field from a current-carrying long straight wire has a magnitude 
at a distance d, what is the magnitude of the field at a distance 2d?
A. also 
B. 0.707
C. 0.693
D.
/2
E. 
/4
You and Mae are in free-float frames. Mae has just passed you, traveling at a speed of 60 km/hr. You throw a ball toward her at a speed of 60 km/hr. What will Mae see the ball doing?
A) She'll see the ball stationary, floating freely in her own reference frame. B) She'll see the ball coming toward her at 60 km/hr. C) She'll see the ball moving away from her at 60 km/hr. D) She'll see the ball coming toward her at 120 km/hr.