Question

8.39 The current in the ci rcuit in Fig. 8.3 is known to be i = B 1e-20001 co s lS00t + B2e-20001 s in 1500t, t 2:'.: 0. The capacitor ha s a value of 80 nF ; the initial value of the current is 7 .5 mA ; and the initial vo lt ag e on the capacitor is -3 0 V. Find t he va lu es of R, L , B 1, and B 2. 8.40 Find the vo lt age a cro ss th e 80 nF ca p ac it or for th e c ir c uit d esc rib ed in Prob le m 8.39 .A ss um e th e r efe r en ce pol a rit y for th e ca p ac ito r v olt age is po sitive at the upper termin a l

          8.39 The current in the ci rcuit in Fig. 8.3 is known to be
i = B 1e-20001 co s lS00t + B2e-20001 s in 1500t, t 2:'.: 0.
The capacitor ha s a value of 80 nF ; the initial value
of the current is 7 .5 mA ; and the initial vo lt ag e on
the capacitor is -3 0 V. Find t he va lu es of R, L , B 1,
and B 2. 8.40 Find the vo lt age a cro ss th e 80 nF ca p ac it or for th e
c ir c uit d esc rib ed in Prob le m 8.39 .A ss um e th e r efe r
en ce pol a rit y for th e ca p ac ito r v olt age is po sitive at
the upper termin a l

Added by Janice C.

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