Question 453: AC fundamentals

Question

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 $\varepsilon  = 18V$. The current $i$ through the battery just after the switch closed is

Accepted Answer

At t = 0, there will be no current flowing through an inductor as it resists the change in current, whereas current will slowly build in it. Also, as switch is closed, inductor will give an infinite resistance where capacitor shows zero resistance, so, current through battery, will be
I = ${E \over {\left( {R/2} ight)}} = {{2E} \over R} = {{2 	imes 18} \over 9}$ = 4 A

Answer

0.2 A

Answer

4 A

Answer

0 ampere

Answer

2 mA

AC fundamentals

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 = 18V. The current i through the battery just after the switch closed is

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