We have an initially uncharged hollow metallic sphere with radius of 5.0 cm. I place a small object with a charge of +20 C at the center of the sphere through a hole in the surface. Find the electric field present at a point 10 cm from the sphere's center. (ke = 8.99 109 N/m2/C2)
a. 3.6E+7 N/C
b. 9.0E+6 N/C
c. 1.8E+7 N/C
d. 4.5E+6 N/C
e. 2.7E+7 N/C
[Ques. 2] A 100-kg spacecraft has a sail of area 300 m2 that is absorbing sunlight of intensity 800 W/m2 . What is the resulting acceleration of the spacecraft?
a. 2.4 m/s2 b. 2.7 106 m/s2
c. 8.0 106 m/s2 d. 3.8 105 m/s2
[Ques. 3] An initially uncharged hollow metallic sphere with radius of 5 cm has a small object with a charge of +15 C carefully placed at the center of the sphere through a hole in the latter's surface. What charge resides inner surface of the sphere?
a. 2 000 C
b. 15 C
c. +15 C
d. zero
e. +2 000
[Ques. 4] The intensity of light from the Sun is 1.3 kW/m2 at the distance of the Earth. The Earth's radius is 6.4 106 m. If all the sunlight that hits the Earth were absorbed, what would be the magnitude of the resulting force on the Earth?
a. 0.0087 N b. 1.8 108 N
c. 5.6 108 N d. 87 N
[Ques. 5] An initially uncharged hollow metallic sphere with radius of 6 cm has a small object with a charge of +14 C carefully placed at the center of the sphere through a hole in the latter's surface. With the charge in place, what charge is now present on the outside surface of the sphere?
a. zero
b. 14 C
c. +5 600 C
d. +14 C
e. 5 600 C
[Ques. 6] A monochromatic light wave in vacuum has frequency f0 and wavelength 0 . Which of the following are also possible frequency and wavelength combinations for a monochromatic light wave in vacuum?
a. 2f0, 20
b. f0/2, 0/2
c. 2f0, 0/2
d. None of the above are possible.
[Ques. 7] The combination of two separated point charges of opposite sign but equal magnitude is called an electric:
a. monopole.
b. dipole.
c. quadrapole.
d. magnapole.
[Ques. 8] A solar cell has a light-gathering area of 12.4 cm2 and produces 0.49 A at 0.93 V (dc) when illuminated with sunlight of intensity 884 W/m2 . What is the efficiency of the solar cell?
a. 42
b. 3.4
c. 64
d. 1.7
e. 19
[Ques. 9] A thin uncharged conducting spherical shell has a charge q carefully placed at its center through a small hole in the shell. The charge q does not touch the shell. What is the charge on the outer surface of the shell?
a. q
b. q
c. 2q
d. 0
[Ques. 10] Peak values for a neodymium-glass laser are 600 J for 1.00 nanosecond. If the cross-section of the laser beam is 1.10 cm2, what are the maximum values of E and B? (0 = 4 107 Tm/A, c = 3.00 108 m/s)
a. 2.0E+9 V/m, 1.9 T
b. 5.7E+8 V/m, 6.8 T
c. 2.0E+9 V/m, 6.8 T
d. 5.7E+8 V/m, 1.9 T
e. Not enough information.
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