# Alternating Current · Physics · Class 12

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CBSE 12th Physics Delhi Set 1 - 2023
Which of the following statements about a series LCR circuit connected to an ac source is correct?
CBSE 12th Physics (Term 1) Paper 2021-22
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...
CBSE 12th Physics (Term 1) Paper 2021-22
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...
CBSE 12th Physics (Term 1) Paper 2021-22
The impedance of a series LCR circuit is -
CBSE 12th Physics (Term 1) Paper 2021-22
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...
CBSE 12th Physics (Term 1) Paper 2021-22
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...
CBSE 12th Physics (Term 1) Paper 2021-22
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...
CBSE 12th Physics (Term 1) Paper 2021-22
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...
CBSE 12th Physics (Term 1) Paper 2021-22
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....
CBSE 12th Physics (Term 1) Paper 2021-22
The core of a transformer is laminated to reduce the effect of
CBSE 12th Physics (Term 1) Paper 2021-22
Assertion (A) : A step-up transformer cannot be used as a step-down transformer.Reason (R) : A transformer works only in one direction.

## Subjective

CBSE 12th Physics Delhi Set 1 - 2023
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...
CBSE 12th Physics Delhi Set 1 - 2023
State the basic principle behind the working of an ac generator. Briefly describe its working and obtain the expression for the instantaneous value of...
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