Question

Q11. A cylinder of material is 10cm long and has an area of cross section of 2cm? If its
resistance along the length be 20 Ohms. What will be its resistivity?​

Answer 1

$\huge\colorbox{pink}{Answer:-}$

Length L = 10 cm

Cross-section A = 2 cm2.

Resistance R = 20 ohm  

We have R = ρL/A, where ρ is the resistivity.  

ρ = RA/L  = 20 x 2/10 = 4  ohm. m

Answer 2

Answer:

resistivity = R*A/L

Explanation:

resistivity = 20 *2* 10^-4 / 10*10-2

resistivity = 0.04