Two resistors of 15 and 30 ? are connected in parallel. If the combination is connected in series with a 9.0-V battery and a 20-? resistor, what is the current through the 15-? resistor?
A)
0.10 A
B)
0.13 A
C)
0.20 A
D)
0.26 A
E)
0.32 A
C
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How does Mercury's magnetic field compare to our own?
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What is the light-gathering power of an 8-inch telescope compared to a 4-inch telescope?
A) 2× better B) 4× better C) 8× better D) 16× better E) 32× better
When Rutherford directed a stream of alpha particles at a gold foil, some particles
A) bounced back. B) continued through the foil. C) deflected at a variety of angles. D) all of the above E) none of the above