Resistance and Resistivity: A wire of resistivity ? must be replaced in a circuit by a wire of the same material but four times as long. If, however, the total resistance is to remain as before, the diameter of the new wire must
A. be the same as the original diameter.
B. be one-half the original diameter.
C. be one-fourth the original diameter.
D. be two times the original diameter.
E. be four times the original diameter.
Answer: D
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A) boosting the energy output of a circuit. B) increasing the current in a resistor. C) smoothing pulsed current. D) changing dc to ac in a circuit. E) increasing or decreasing voltage.
What is an "extrasolar planet"?
A) a planet that is extra large compared to what we'd expect B) a planet that is considered an "extra," in that it was not needed for the formation of its solar system C) a planet that orbits a star that is not our own Sun D) a planet that is larger than the Sun
A 60.0-Hz AC generator with a peak voltage of 110 V drives a series RL circuit with R = 10.0 ? and L = 10.0 mH. The peak current in the circuit is
a. 0.963 A. b. 10.3 A. c. 11.0 A. d. 11.9 A. e. 29.2 A.
One angstrom = 
m and one fermi = 
What is the relationship between these units?
A. 1 angstrom = 
fermi
B. 1 angstrom = 
fermi
C. 1 angstrom = 
fermi
D. 1 angstrom = 
fermi