The resistivity, \(\mathit{P}\), of a material of length l, cross-sectional area A, resistance R, is given by the equation
A
\(\mathit{P} = \frac{RA}{l}\)
B
\(\mathit{P} = \frac{l}{RA}\)
C
\(\mathit{P} = \frac{Rl}{A}\)
D
\(\mathit{P} = \frac{R}{Al}\)
Verified Correct Answer: A.
Physical Principles & Numerical Solution
resistivity P is directly proportional to the product of resistance and cross-sectional area and inversely proportional to the length of the wire
Source: Myschool Past Questions Archive (Record #35494)