A charged particle having electric charge Q=4.0 e enters a region of magnetic field 1.2 T at an angle of 
relative to the magnetic field direction. If the speed of the particle upon entering the region is 2.8 x 104 m/s and the magnitude of the force on it is 1.3 x 10-14 N, what is the angle 
?
a. 
b. 
c. 
d. 
b.
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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.
Are sand dunes stationary or do they move and migrate?
What will be an ideal response?
Approximately, what basic composition are all stars born with?
A) half hydrogen, half helium, no more than 2 percent heavier elements B) three-quarters hydrogen, one-quarter helium, no more than 2 percent heavier elements C) 90 percent hydrogen, 10 percent helium, no more than 1 percent heavier elements D) one-quarter hydrogen, three-quarters helium, no more than 2 percent heavier elements E) 98 percent hydrogen, 2 percent helium
In what way(s) has Pluto long been known to be different from the planets?
A) Its orbit is more inclined to the ecliptic plane. B) It is composed primarily of ices. C) It is far smaller than the terrestrial planets. D) It has a highly eccentric orbit. E) All of the above