Answer:
(a) 14.88 ohm
(b) 1.88 A
(c) -74.4°
Step-by-step explanation:
Vo = 28 V
f = 12 kHz = 12000 Hz
R = 4 ohm
L = 30 micro henry = 30 x 10^-6 H
C = 800 nF = 800 x 10^-9 F
(a)
The inductive reactance,
XL = 2 π f L = 2 x 3.14 x 12000 x 30 x 10^-6 = 2.26 ohm
The capacitive reactance

Xc = 16.59 ohm
Let the impedance is Z.

Z = 14.88 ohm
(b)
The formula for the amplitude of current

Io = 1.88 A
(c)
Let the phase difference is Ф

Ф = -74.4°