A parallel plate capacitor has an air dielectric. The capacitor is charged with surface charge density
and then the voltage source is removed. When an insulator with dielectric constant 5.0 is inserted between the plates, what happens to the electric field strength if the surface charge density does not change?
A. it increases by a factor of 5
B. it increases by a factor of 25
C. it decreases by a factor of 5
D. it decreases by a factor of 25
E. it stays the same
C. it decreases by a factor of 5
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Insulating materials are composed of atoms with
A) weak cohesive forces. B) tightly bound outer electrons. C) excess protons. D) vastly more charge than conductors.
Two children start at one end of a street, the origin, run to the other end, then head back. On the way back Joan is ahead of Mike. Which statement is correct about the distances run and the displacements from the origin?
a. Joan has run a greater distance and her displacement is greater than Mike's. b. Mike has run a greater distance and his displacement is greater than Joan's. c. Joan has run a greater distance, but her displacement is less than Mike's. d. Mike has run a greater distance, but his displacement is less than Joan's. e. Mike has run a shorter distance, and his displacement is less than Joan's.
Nuclear Fission and Fusion: The energy radiated by a star, such as the sun, results chiefly from
A. beta decay. B. alpha decay. C. fission reactions. D. fusion reactions. E. radioactivity.
The device that spreads light into its component colors in a spectroscope is a
A) prism. B) diffraction grating. C) either of these D) neither of these