Alternating Current - Result Question 12
12. A circuit when connected to an $AC$ source of 12 $V$ gives a current of $0.2 A$. The same circuit when connected to a DC source of $12 V$, gives a current of 0.4 A. The circuit is [NEET Odisha 2019]
(a) Series LCR
(b) Series LR
(c) Series RC
(d) Series LC
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Answer:
Correct Answer: 12. (b)
Solution:
(b) $I_1=\frac{V}{Z}$
$ I_1=\frac{12}{\sqrt{R^{2}+(X_L-X_C)^{2}}}=0.2 A $
In second case, the capacitor would provide infinite resistance but current is present in circuit, it means resistor and inductor can be present in the circuit.
Since current with AC source and DC source are different, inductor must be present with resistance.
