A)
X-sectional area Length Double Double
B)
X-sectional area Length Double No change
C)
X-sectional area Length No change Half
D)
X-sectional area Length Half No change
Correct Answer: D
Solution :
Resistance of a wire is inversely proportional to its area of cross section. Therefore, reducing the area of cross section by half will double the resistance without any change in the length.
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