Embibe Experts Solutions for Exercise 4: Assignment

If the power factor in an $AC$ circuit changes from $\frac{1}{3}$ to $\frac{1}{9}$ then by what percent reactance will change (approximately), if resistance remains constant?

In the circuit shown in figure, if both the bulbs $B_1$ and $B_2$ are identical then

Mark the incorrect statement

A step-up transformer operates on $220 \mathrm{V}$ line and supplies $2.2 \mathrm{A}.$ The ratio of primary and secondary winding is $11: 50.$ The output voltage in the secondary is

In $L-C$ oscillation, maximum charge on capacitor can be $Q.$ If at any instant, electric energy and magnetic energy associated with circuit is equal, then charge on capacitor at that instant is

A series $LCR$ circuit consists of an inductor $L$ a capacitor $C$ and a resistor $R$ connected across a source of emf $\epsilon ={\epsilon }_0\sin \omega t.$ When $\omega L=\frac{1}{\omega C}$ the current in the circuit is $I_0$ and if angular frequency of the source is changed to $\omega \text{'},$ the current in the circuit becomes $\frac{I_0}{2},$ then the value of $\left|\omega \text{'}L-\frac{1}{\omega \text{'}C}\right|$ is

In the alternating current circuit shown in the figure, the currents through resistor and capacitor are $3 \mathrm{A}$ and $4 \mathrm{A}$ respectively. The current drawn from generator is

When speed of a dc motor increases, the armature current