The resistivity, \(\mathit{P}\), of a material of length l, cross-sectional area A, resistance R, is given by the equation
-
\(\mathit{P} = \frac{RA}{l}\)
- \(\mathit{P} = \frac{l}{RA}\)
- \(\mathit{P} = \frac{Rl}{A}\)
- \(\mathit{P} = \frac{R}{Al}\)
The correct answer is: A
Explanation
resistivity P is directly proportional to the product of resistance and cross-sectional area and inversely proportional to the length of the wire