Two metallic wire A and B of same material and have equal length. It the cross-sectional area of B is double that of A then which one among the following is the electric resistance of B
a) twice that of A
b) 4 times that of A
c) 1/4 that of A
d) 1/2 that of A
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a) twice that of A because A has resistance R and B has double surface so R²
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