Current Electricity Charging Discharging Of Capacitors Question 340
Question: A certain wire has a resistance $ R $ . The resistance of another wire identical with the first except having twice its diameter is
[CPMT 1999]
Options:
A) $ 2,R $
B) $ 0.25,R $
C) $ 4,R $
D) $ 0.5,R $
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Answer:
Correct Answer: B
Solution:
$ R\propto \frac{1}{A}\Rightarrow R\propto \frac{1}{r^{2}}\propto\frac{1}{d^{2}} $ [d = diameter of wire]
BETA
