For the $RC$ circuit shown, the resistance is $R = 10.0\ W$, the capacitance is $C = 5.0\ F$ and the battery has voltage $\xi= 12$ volts . The capacitor is initially uncharged when the switch $S$ is closed at time $t = 0$. At some time later, the current in the circuit is $0.50\ A$. What is the magnitude of the charge across the capacitor at that moment?.......$µC$
$0 $
$25$
$30$
$35$
If an $AC$ main supply is given to be $220\,V$. The average $emf$ during a positive half cycle will be.....$V$
The frequency of $ac$ mains in India is.......$Hz$
The alternating current in a circuit is described by the graph shown in figure. Show rms current in this graph.
In a circuit, current varies with time as $i = 2\sqrt t $ . Root mean square value of current for interval $t = 2\,s$ to $t = 4\,s$ is
A $40$ $\Omega$ electric heater is connected to a$ 200 V, 50 Hz$ mains supply. The peak value of electric current flowing in the circuit is approximately......$A$