Saved Bookmarks
| 1. |
resistance of a metal wire of length 1m is 26ohm at 20degree C. if the diameter pf the wire is 4m. what will be the resistivity of the metal at that temperature |
|
Answer» Answer:
Resistivity = 31*10^-5 OHM meter Resistance = 26 ohm length = 1m Diameter = 4m Radius = 2 m Ar. of cross section = π*r^2 = 3.14*2*2 = (314/25) we know that , R = e*L/A = e*L/A e = L/A*R = e*L/A e = L/A*R e = 1/ (314/25)*26 = e*L/A e = L/A*R e = 1/ (314/25)*26 e = 25/ 314*26 e = 25/ 8164 e = 0.00306 e = 306* 10^ -5 ohm meter e = 31*10^-5 ohm meter
|
|