D(t)=e(B, cos v2t+B2 sin v2t)V tir i(o ie U(0)=0→>0=B 10.597H ∴0(t)=e"B2sin√2t e du(t) =√2eB,cos√2t-2eB,sin√2t dt du(t 2B,=2(0) 420→B,=210 dt t=0 C ∴U(t)=210√2e2tsin√2tv 718J m1=0.4355→Uml=718 m2 m2 2657s→>0m2 0.845V 0.845 mIt e t V t ( ) 210 2 sin 2 −2  = 0 0 1 (0) = → = B t e B t B t V t ( ) ( cos 2 sin 2 ) 1 2 2 = + −  t e B t t ( ) 2 sin 2 −2  = e B t e B t dt d t t t 2 cos 2 2 sin 2 ( ) 2 2 2 −2 − = −  420 210 2 (0) 2 0 ( ) = 2 = = → 2 = = B C i B dt t d t  c  t m1 t m2 t 71.8V − 0.845V t s V t s V m m m m 2.657 0.845 0.435 71.8 2 2 1 1 = → = − = → =   R i c i 10.5 i(t) 7H F 42 1  Re f