Alternating Current · Physics · Class 12

Which of the following statements about a series LCR circuit connected to an ac source is correct?

The rms current in a circuit connected to a 50 Hz ac source is 15 A. The value of the current in the circuit $$\left( {{1 \over {600}}} \right)$$s aft...

In a circuit the phase difference between the alternating current and the source voltage is $${\pi \over 2}$$. Which of the following cannot be the e...

The impedance of a series LCR circuit is -

When an alternating voltage E = Eo sin $$\omega$$t is applied to a circuit, a current $$I = {I_o}\sin \left( {\omega t + {\pi \over 2}} \right)$$ flo...

The voltage across a resistor, an inductor, and a capacitor connected in series to an ac source are 20 V, 15 V and 30 V respectively. The resultant vo...

A circuit is connected to an ac source of variable frequency. As the frequency of the source is increased, the current first increases and then decrea...

A 15 $$\Omega$$ resistor, an 80 mH inductor and a capacitor of capacitance C are connected in series with a 50 Hz ac source. If the source voltage and...

A 300 $$\Omega$$ resistor and a capacitor of $$\left( {{{25} \over \pi }} \right)$$ $$\mu$$F are connected in series to a 200 V $$-$$ 50 Hz ac source....

The core of a transformer is laminated to reduce the effect of

Assertion (A) : A step-up transformer cannot be used as a step-down transformer.Reason (R) : A transformer works only in one direction.

An alternating voltage of $$220 \mathrm{~V}$$ is applied across a device $$X$$. A current of 0.22 A flows in the circuit and it lags behind the applie...

State the basic principle behind the working of an ac generator. Briefly describe its working and obtain the expression for the instantaneous value of...

A series CR circuit with $$R=200 \Omega$$ and $$C=(50 / \pi)$$ $$\mu \mathrm{F}$$ is connected across an ac source of peak voltage $$\varepsilon_0=100...