Question

The switch has been open for a long time before being closed at t = 0. Find the initial value i (0) and the time constant of the RL circuit for t>O. 212 240 Xt=0 381 0.4 H 4. The switch has been closed for a long time and is opened at t = 0. Find (a) i (0) and i (0*); 102 50 2 (b) i(t) fort >0; (c) (t) at t = 5 ms. 100 V + 3 2012 03 0.2 H Viro

Answer 1

Insya at t-o- Iductor acts as a short wireit due to fully oa Charae sor or Spor E 100v_ 460) 6 itage in parallel remain some - 460) - loe -4 2A 50 & (0) = 1, (ot) -JA S due to initial condition rule? far t o Change in laplace domain w5ar - Loov 9 3025 49) Lilot) : 0:2XQ_ = 0.4 Av on (20+10+50 +0.25 ) I(s) - 04 20 - US 04 -09 80 +0.25 > Ils) = 2 Take inverse Laplace S+400 T 80 +0.25 021 0.25s +80] + 807 02
1
C Vilt) at t = 5 msec - 5x10-35 V (t) = L dig dt | t= 5x10 3 see VU) - 0.2 d (21- yoot) UQ ?(-400 € -160- you x 5X10- -1600-2 IV u = -21.65v
2