Question

27. A coil has resistance 30 ohm and inductive
reactance 20 ohm at 50 Hz frequency. If an ac
source, of 200 volt, 100 Hz, is connected across
the coil, the current in the coil will be
(a) 2.0 A
(b) 4.0 A
(c) 8.0A
(d) 13
(Mains 2011​

Answer 1

X

L

=2πfL

X

L

αf

X

L

1

X

L

2

=

f

1

f

2

⇒X

L

2

=40Ω

R=30Ω

Z=

(30)

2

+(40)

2

=50Ω

I=

Z

V

=

50

200

=4A

Answer 2

Answer:

(b) 4.0 A

Step-by-step explanation:

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