Generating A.C

A $15.0$ $\text{μF}$  capacitor is connected to $220$ $\text{V,}$ $50$ $\text{Hz}$ source. The capacitive reactance and the RMS current would be:

A resistor of  $200\Omega$  and a capacitor of 15.0 $\text{μF}$  are connected in series to a 220 V, 50 Hz a.c. source. Calculate

​(i) The current in the circuit.

(ii) The rms voltage across the resistor and the capacitor.

In a series LCR circuit, the voltage across an inductor, capacitor and resistor are $20 \mathrm{V}$, $20 \mathrm{V}$ and $40 \mathrm{V}$ respectively. What is the phase difference between the applied voltage and the current in the circuit?

A rectangular frame $ABCD$ made of a uniform metal wire has a straight connection between $E$ and $F$ made of the same wire as shown in the figure. $AEFD$ is a square of side $1 \mathrm{m}$ and $EF=FC=0.5 \mathrm{m}$. The entire circuit is placed in a steadily increasing uniform magnetic field directed into the plane of the paper and normal to it. The rate of change of the magnetic field is $1 \mathrm{T} {\mathrm{s}}^{-1}$, the resistance per unit length of the wire is $1 \mathrm{\Omega } {\mathrm{m}}^{-1}$.  If the current in segments $BE$ is $\frac{x}{22} \mathrm{A}$, find $x$.

What is the role of a commutator in a DC generator and an electric motor?

A current that always flows through an electric device in the same direction is called direct current or $\mathrm{DC}$. The polarity (positive and negative) of a direct current is fixed. A current that reverses direction at equal intervals of time is called the alternating current or $\mathrm{AC}$. The polarity (positive and negative) of an alternating current is not fixed. Both $\mathrm{DC}$ and $\mathrm{AC}$ can be used for lighting and heating. Some electric devices like the television need $\mathrm{DC}$ to operate. In such cases, an adapter or a device is fitted into them to convert $\mathrm{AC}$ from the mains supply to $\mathrm{DC}$.

On the basis of above information, answer the following :

A current that always flows through an electric device in the same direction is called direct current or $\mathrm{DC}$. The polarity (positive and negative) of a direct current is fixed. A current that reverses direction at equal intervals of time is called the alternating current or $\mathrm{AC}$. The polarity (positive and negative) of an alternating current is not fixed. Both $\mathrm{DC}$ and $\mathrm{AC}$ can be used for lighting and heating. Some electric devices like the television need $\mathrm{DC}$ to operate. In such cases, an adapter or a device is fitted into them to convert $\mathrm{AC}$ from the mains supply to $\mathrm{DC}$.

On the basis of above information, answer the following :

Explain dynamo effect?

An AC generator is connected to an electric appliance. In $10$ revolutions of the armature, how many times the current in the appliance changes direction?

An AC generator is connected to an electric appliance. In $5$ revolutions of the armature, the current in the appliance changes direction

A movable wire is moved to the right, that causes an anti-clock-wise induced current as shown in the figure. The direction of magnetic induction in the region P points

Dynamo is a device used for converting

The current that changes its magnitude and polarity at regular interval of time is called?

The frequency of alternating current in India is $50 \mathrm{Hz}$.

The main difference between an AC generator and a DC generator is that:

What is the principle of working of an AC generator?

A metal conductor of length $1 \mathrm{m}$ rotates vertically about one of its ends at angular velocity $5 \mathrm{rad} {\mathrm{s}}^{-1}$. If the horizontal component of earth's magnetic field is  $0.2\times {10}^{-4} \mathrm{T}$, then the emf (in $\mathrm{\mu V}$) developed between the ends of the conductor is

A six-pole generator with fixed field excitation develops an emf of $100 \mathrm{V}$, when operating at $1500 \mathrm{rpm}$. At what speed (in rpm) must it rotate to develop an emf of $120 \mathrm{V}$?

Dynamo is a device used for converting,

Lenz 's law used to find out the direction of