Saved Bookmarks
| 1. |
Estimate the average drift speed of conduction electrons in a copper wire of cross-sectional area 1.0 xx 10^(-7) m^2 carrying a current of 1.5 A. Assume the density of conduction electrons to be 9 xx 10^28 m^(-3) . |
|
Answer» SOLUTION :Here `A= 1.0 xx 10^(-7) m^2 , I = 1.5 A , n = 9 xx 10^28 m^(-3) " and " e = 1.6 xx 10^(-19) C` `I = nA ev_d` ` therefore ` AVERAGE drift speed `v_d = (I)/(nAe) = (1.5)/(9 xx 10^28 xx 1.0 xx 10^(-7) xx 1.6 xx 10^(-19) ) ` ` = 1.04 xx 10^(-3) MS^(-1)" or" 1.04 mm s^(-1)` |
|