14 × 50 × 25 48 × 10–3 W = 8 W
21
XC
νC
=
π
6
1
4
2
3 14
50
796
10−
=
=
Ω
×
×
×
×
Therefore,
2
2
2
2
(
)
3
(8
4)
L
C
Z
R
X
X
=
+
−
=
+
−
    = 5 W
(b) Phase difference, f = tan–1
C
L
X
X
R
−
=
−


 = −
°
tan− 1
4
38
53 1
 EXAMPLE 7