Saved Bookmarks
| 1. |
20 million electron reaches X to a point Y in 2 micro second. what is direction and magnitude of current? |
|
Answer» Number of electrons - 20 million Time - 2 micro secondFind - DIRECTION and MAGNITUDE of currentSolution - Magnitude of current is calculated by the formula - Q = I*T.In the formula, q is charge, I is current and t is time. Further Q can be represented as - Q = ne, where n is number of electrons and e is charge on ELECTRON. Equating both the equations,n*e = I*tKeeping the values in equation-n = 20 million = 2*10^7T = 2 micro second = 2*10^-6 seconds.2*10^7*1.6*10^-19 = I*2*10^-6I = 1.6*10^-6 CDirection of current will be from Y to X. This is because current is directed towards movement of positive charges. |
|