A 6.0-?F air-filled capacitor is connected across a 100-V voltage source. After the source fully charges the capacitor, the capacitor is immersed in transformer oil (of dielectric constant 4.5)
How much ADDITIONAL charge flows from the voltage source, which remained connected during the process?
A) 1.2 mC
B) 1.5 mC
C) 1.7 mC
D) 2.1 mC
E) 2.5 mC
D
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How small are red blood cells?
A.) 10^-3 m. B.) 10^-4 m. C.) 10^-5 m. D.) 10^-6 m. E.) 10^-7 m.
If an electric field is applied to a metal
a. very few electrons are excited into the conduction band. b. electrons having energies near the Fermi energy require only a small amount of additional energy from the applied field to reach nearby empty energy states. c. electrons having energies near the bottom of the band require only a small amount of additional energy from the applied field to reach nearby empty energy states. d. the principal mode of conduction is through the motion of holes in the filled part of the band. e. the Fermi energy Ef becomes equal to the applied electric field E.
The velocity of a particle as a function of time is given by v(t) = (2.3 m/s) + (4.1 m/ s2 )t - (6.2 m/ s3 )t2. What is the average acceleration of the particle between t = 1.0 s and t = 2.0 s?
A) -13 m/ s2 B) -15 m/ s2 C) 13 m/ s2 D) 15 m/ s2 E) 0 m/ s2
As an electron moves closer to the nucleus, it ________ energy.
A. generates B. absorbs C. quantizes D. loses E. gains