... R th 4 -i = i( t ) = i(0) e - t τ = -1 .5 e -4 t , t > di v L = v o = L = -1 .5 (-4 )(1/3) e -4 t dt -4 t v o = e V, t > vx = v = 0.5 e -4 t V , t > +1 L PROPRIETARY MATERIAL © 2007 The McGraw-Hill Companies,... (t )] dt Chapter 7, Solution 31 (a) (b) = e = 112 × 10 ∫ [ e δ(t − 2)] dt = e ∫ [ δ(t ) + e δ(t ) + cos 2πt δ(t )] dt = ( + e + cos(2πt )) ∞ - ∞ - - 4t - 4t -t t=2 -9 -1 6 -t t =0 = +1+1 = PROPRIETARY... Prob 7.18 Chapter 7, Solution 18 If v( t ) = , the circuit can be redrawn as shown below L , τ= = × = R -t τ -3 t i( t ) = i(0) e = e di - (-3 ) e -3 t = 1.2 e -3 t V v o ( t ) = -L = dt R eq = || =