Alternating Current - Result Question 14
14. Figure shows a circuit that contains three identical resistors with resistance $R=9.0 \Omega$ each, two identical inductors with inductance $L=2.0$ $mH$ each, and an ideal battery with emf $\varepsilon=18 V$. The current ’ $i$ ’ through the battery just after the switch closed is
[2017]
(a) $0.2 A$
(b) $2 A$
(c) 0
(d) $2 mA$
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Answer:
Correct Answer: 14. (b)
Solution:
- (b)
At $t=0$, no current flows through $R_1$ and $R_3$
Current through battery just after the switch closed is
$ i=\frac{\varepsilon}{R_2}=\frac{18}{9}=2 A $
