A conductor has a diameter of 1.00 mm and length 2.00m. if the resistance of the material is 0.1âŚ, its resistivity is?
- 2.55 x 105 âŚm
- 2.55 x 102 âŚm
- 3.93 x 10-6 âŚm
-
3.93 x 10-8 âŚm
The correct answer is: D
Explanation
R = (1)/a, P = (R.a)/1 = (0.1 x 3.14)/2 (10-3/2)3â´ P = (0.1 x 3.14 x 10-6)/2 x 4
= 0.3925 x 10-7 OR -3.930 X 10-8 âŚm