Question

Resistance if metal wire of length 1m is 22 ohm at 20°C. If the diameter of the wire is 0.4m,what will be the resistivity of the metal at that temperature

Answer 1

Answer:

Step-by-step explanation:

l = 1m

R = 22 ohm

diameter = 0.4m

thus radius = 0.2m

area = pi x r^2

$Resistivity = R \frac{a}{l}$

thus = 22 *  0.62/1 = 13.64 ohm meter