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Capacitors

Q1:

The total circuit reactance is ______ in the given circuit.

A
50 omega.gif

B
140 omega.gif

C
265 omega.gif

D
676 omega.gif

ANS:A -

50 omega.gif

C2//C3 = 1μF + 5μF = 6μF.
C2//C3 series with C1 so: ((C2//C3)*C1)/((C2//C3)+C1).
(6μF*2μF)/(6μF+2μF) = 1.5μF.
Xceq = 1/(2π*f*C) = 1/(2π*400*1.5μF) = 265.2582385 ohms not 50 ohms.



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