$A$ $42 \, mH$ inductor is connected to a $200 \, V, 50 \, Hz$ a.c. supply. The r.m.s. value of current in the circuit will be nearly (Take $\pi = \frac{22}{7}$) (in $ \, A$)

The voltage across a pure inductor is represented by the following diagram. Which of the following diagrams will represent the current?

An alternating voltage $E = 200\sqrt{2} \sin(100t)$ is connected to a $1 \mu F$ capacitor through an $AC$ ammeter. The reading of the ammeter shall be $mA$.

The inductive reactance of a coil is $X_{L}$. If the inductance of a coil is tripled and the frequency of the $A.C.$ supply is doubled,then the new inductive reactance will be

$A$ parallel plate capacitor having plates of radius $6 \text{ cm}$ has capacitance $100 \text{ pF}$. It is connected to a $230 \text{ V}$ a.c. supply with angular frequency $300 \text{ rad/s}$. The r.m.s. value of current is:

The average power dissipation in a pure capacitance in an $AC$ circuit is