A series circuit consists of a 100-V DC power source, a 100-? resistor, and a variable resistor of resistance R, which varies from 0 to 100 ?. The current in the circuit is
?
?
A. directly proportional to R.
B. inversely proportional to R.
C. directly proportional to (100 ? + R).
D. inversely proportional to (100 ? + R).
E. neither directly nor inversely proportional to R or to (100 ? + R).
Answer: D
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