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In the circuit shown , the current I supplied by sinusoidal current source is
(a) 28 A
(b) 4 A
(c) 20 A
(d)insufficient data
Answer is (c)
Concept
$\overrightarrow I = \overrightarrow I_{R} + \overrightarrow I_{L}$
$\lvert I \rvert = \sqrt{ 144 + 256}$ = 20 A
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