When there is electric current through a metal wire, the moving charges are
A) only protons.
B) only electrons.
C) both protons and electrons.
D) positive metal ions.
E) negative metal ions.
B
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The amount of heat energy a refrigerator removes from the food stored inside it is ___________ the amount of electrical energy required to run the refrigerator
a. equal to b. greater than c. less than d. unrelated to
A thin converging lens is found to form an image of a distant building 24 cm from the lens. If an object is placed 16 cm from the lens, how far from the object will the image be?
A) 64 cm B) 72 cm C) 32 cm D) 96 cm E) 48 cm
The force between two unlike magnetic poles
A. increases as the separation distance between them increases in a linear fashion B. increases as the separation distance increases, but proportional to the square of the distance C. decreases as the separation distance between them increases, in a linear fashion D. decreases as the separation distance between them increases, but in proportion to the square of the distance.
Compared to the mass of a proton, the mass of an electron is
A) very much less. B) identical. C) greater.