, L, R. , R (R 0), (. 18), , .
. 18
, q. t = 0 (. 18, ) . , , I. , (. 18, ). , , , , , , . , , , , , , (. 18, ). (. 18, ), t = ( ) (. 18, ). , q , UC I, . UC , :
.
, UC = q / C, I = dq / dt, q :
.
q (t), q :
,
q (t) t;
q 0 ;
( ) ();
=2 / T (T , );
t;
, t =0.