Between a pair of equal and opposite charges, field lines are
A) directed from positive to negative.
B) more concentrated closer to the charges.
C) vectors, with patterns that stem from the inverse-square law.
D) all of the above
E) none of the above
Answer: D
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If the total energy of an electron in an accelerator is three times its rest energy, what is its speed? (c = 3.00 × 10^8 m/s)
a. 2.00 × 10^8 m/s b. 1.30 × 10^8 m/s c. 1.41 × 10^8 m/s d. 2.98 × 10^8 m/s e. 2.83 × 10^8 m/s
According to present theories of light, in some experiments light seems to be:
a. composed of particles which can neither be created nor destroyed. b. a particle whose quantized energy depends on its velocity. c. a wave that moves from one place to another if there is material to vibrate. d. none of the above.
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The critical fiber length divided by the fiber _________is equal to the critical aspect ratio.
Fill in the blank(s) with the appropriate word(s).