We have a hollow metallic sphere with charge 5.20 C and radius 5.40 cm. We insert a +10.4-C charge at the center of the sphere through a hole in the surface. What charge now rests on the outer surface of the sphere?
a. +5.20 C
b. +15.6 C
c. 5.20 C
d. 15.6 C
e. 10.4 C
[Ques. 2] A radio wave signal, which transmits at a frequency of 5.64 MHz, has what wavelength? (c = 3.00 108 m/s)
a. 532 m
b. 106 m
c. 53.2 m
d. 167 m
e. 28.3 m
[Ques. 3] If a charge +Q is placed inside a hollow isolated conductor that is originally neutral and the charge does not touch that conductor at any time:
a. the inside surface of the conductor will become positively charged.
b. the outside surface of the conductor will become positively charged.
c. both the inner and outer surfaces will remain neutral.
d. both the inner and outer surfaces will become negative.
[Ques. 4] Glass panes are opaque to a certain type of radiation, which passes through quartz. What type of radiation is it? This radiation is important in ozone layer reactions.
a. microwave
b. gamma
c. x-ray
d. ultraviolet
[Ques. 5] Two identical balls have the same amount of charge, but the charge on ball A is positive and the charge on ball B is negative. The balls are placed on a smooth, level, frictionless table whose top is an insulator. Which of the following is true?
a. Since the force on A is equal but opposite to the force on B, they will not move.
b. They will move together with constant acceleration.
c. Since the force on both balls is negative, they will move in the negative direction.
d. None of the above is correct.
[Ques. 6] In order to keep its food hot, a restaurant will place it under which type of lamp?
a. infrared
b. visible light
c. ultraviolet
d. x-ray
[Ques. 7] A ping-pong ball covered with a conducting graphite coating has a mass of 5.4 103 kg and a charge of 3.8 C. What electric field directed upward will exactly balance the weight of the ball? (g = 9.8 m/s2)
a. 7.2E+1 N/C
b. 1.4E+4 N/C
c. 6.3E8 N/C
d. 2.1E+6 N/C
e. 6.9E+6 N/C
[Ques. 8] A radar pulse returns 5.0 104 seconds after it is sent out, having been reflected by an object. What is the distance between the radar antenna and the object? (c = 3.00 108 m/s)
a. 1.5E+5 m
b. 2.4E+5 m
c. 7.5E+4 m
d. 2.5E+4 m
e. 4.3E+4 m
[Ques. 9] Two identical spheres each carry a charge of 82.0 C. The spheres are separated by a distance of 2.00 m. What is the electric force between the spheres? (ke = 8.99 109 Nm2/C2)
a. 0.184 N (repulsive)
b. 15.1 N (repulsive)
c. 30.2 N (attractive)
d. 1.47 N (attractive)
e. 37.8 N (attractive)
[Ques. 10] In order of increasing frequency, which of the following is correct?
a. visible, radio, ultraviolet and x-ray
b. infrared, visible, ultraviolet and gamma
c. visible, gamma, ultraviolet and x-ray
d. infrared, x-ray, visible and gamma
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