Sphere A carries a net charge and sphere B is neutral. They are placed near each other on an insulated table. Which statement best describes the electrostatic force between them?
A) There is no force between them since one is neutral.
B) There is a force of repulsion between them.
C) There is a force of attraction between them.
D) The force is attractive if A is charged positively and repulsive if A is charged negatively.
E) The force is repulsive if A is charged positively and attractive if A is charged negatively.
C
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Diverging light rays from a nearby object (a few focal lengths away from the mirror) strike the surface of a concave mirror. After reflecting from the mirror's surface, the rays will converge at
a. the mirror's focal point. b. a point beyond the mirror's focal point. c. a point nearer than the mirror's focal point. d. none of the above.
At t = 0 the switch S is closed with the capacitor uncharged. If C = 30 ?F, ? = 30 V, and R = 5.0 k?, at what rate is energy being stored in the capacitor when I = 2.0 mA?
a.
32 mW
b.
40 mW
c.
44 mW
d.
36 mW
e.
80 mW
If the minus sign were not in Faraday's law it would lead to a violation of the law of conservation of energy
Indicate whether the statement is true or false
Two emerging beams of light produced by a birefringent crystal
A) are at different frequencies. B) will produce an interference pattern when recombined. C) are polarized in the same direction. D) are polarized in mutually perpendicular directions. E) are at 90° with respect to one another.