Mars may have been more Earth-like in the past because
A) its atmosphere was thicker and warmer
B) it was rotating more rapidly
C) the Sun was dimmer, putting out less solar radiation
D) it was not as close to the Sun
A
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A conducting sphere of radius 20 cm has a charge Q placed on it producing a field of magnitude
at its surface. More charge is added to the surface until the magnitude of the field at the surface is 2
How much charge was added to the surface?
A. Q/2 B. Q C. 2 Q D. 1.4 Q E. 3 Q
Energy in Inductors: Inductors store energy by accumulating excess charge within their coils.
A. True B. False
Match the moons listed to the left with the characteristics described in the sentences to the right. Drag words from the left to the blanks on the right. Each moon should be used only once.
Which force field can increase a moving electron's speed?
A) electric field B) magnetic field C) both of these D) neither of these