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The resistance of a wire is...

The resistance of a wire is

A

directly proportional to its area of cross-section

B

inversely proportional to its area of cross-section

C

independent of its area of cross-section

D

proportional to square of its area of cross-section

Text Solution

Verified by Experts

The correct Answer is:
B
The resistance of a wire is Inversely proportional to Its area of cross section.
Resistance of a wire is given by
`R = rho (l)(/(A)`
`rho` = resistivity, l= length of wire, and A=cross-section area
`because R prop rho_(1) R prop l, R prop (1)/(A)`
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