In the problem, the parameters of an RLC circuit with input voltage E(t) are given. Substitute

Is p (t)=Acost+Bsint

in the equation :

LI+RI+(1/C)I=E(t)

using appropriate values of , to find the steady periodic current in the form I_sp (t) = I_0 sin(t - )

(i think is delta?)

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R = 100 Ohm

L = 2H

C = 510 6 F

E(t) = 110sin(60 t) V

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the answer should be:

Is p (t) = 0.1591 sin(60 t - 4.8576) approximately