Saved Bookmarks
| 1. |
A solenoid of 2000 turns is wound over a length of 0.3 m. The area aof cross section is `1.3 xx 10^(-3) m^(2)`. Around its central seciton, a coil of 300 turns is closely wound. If an initial current of 2 A is reversed in 0.25 s, find the e.m.f induced in the coil . |
|
Answer» Here, `N_(1) = 2000m l = 0.3 m`, `A = 1.2 xx 10^(-3) m^(2), N_(2) = 300` `dI = 2 - (-2) = 4 A, dt = 0.25 s, e = ?` `M = (mu_(0) N_(1) N_(2) A)/(1)` ` (4 pi xx 10^(-7) xx 2000 xx 300 xx 1.2 xx 10^(-3))/(0.3)` `=3 xx 10^(-3) H` `|e| = M (dI)/(dt) = 3 xx 10^(-3) xx (4)/(0.25) = 0.048 V` |
|