The resistance of a cylindrical conductor is:
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → inversely proportional to the square of the radius
Resistance of a cylindrical conductor:
$R = \rho \frac{L}{A}$
$A = \pi r^2$
$R = \rho \frac{L}{\pi r^2}$
So, $R \propto \frac{1}{r^2}$
Answer: Inversely proportional to the square of the radius