A) Length = 50 cm, diameter = 0.5 mm
B) Length = 100 cm, diameter = 1 mm
C) Length = 200 cm, diameter = 2 mm
D) Length = 300 cm, diameter = 3 mm
Correct Answer: A
Solution :
\[R\propto \frac{l}{{{r}^{2}}}\]. For highest resistance \[\frac{l}{{{r}^{2}}}\] should be maximum, which is correct for option
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