✓ Board-verified
Physics · 2024 · 3 marks
CBSE 2024 · Region 3 · Set 1 · Q24
A sinusoidal voltage is applied to an electric circuit containing a circuit element ' X ' in which the current leads the voltage by (π)/2. (a)…
A sinusoidal voltage is applied to an electric circuit containing a circuit element ' X ' in which the current leads the voltage by $\displaystyle \frac{\pi}{2}$.
(a)
Identify the circuit element ' X ' in the circuit.
(b)
Write the formula for its reactance.
(c)
Show graphically the variation of this reactance with frequency of ac voltage.
(d)
Explain the behaviour of this element when it is used in (i) an ac circuit, and (ii) a dc circuit.
Marking-scheme solution
(a) Identifying the element X
(b) Writing the formula for reactance
(c) Showing variation of reactance with frequency
(d) Explanation of behavior of element with
(i) an ac circuit
(ii) a dc circuit
(a) Capacitor
(b) \(\displaystyle \mathrm{X}_{c}=\frac{1}{\omega c}\)
All Alternating Current questions2024 question paperNCERT solutions: Alternating CurrentPractice Alternating Current →
More from Alternating Current
- Distinguish between reactance and impedance of an ac circuit. Show that an ideal inductor in an ac circuit does not dissipate any power.2024
- An alternating current is given by I=I_0 cos (100 π) t. The least time the current takes to decrease from its maximum value to zero will be:2025
- A resistor of 30 Ω and a capacitor of 250/(π) μ F are connected in series to a 200 V, 50 Hz ac source. Calculate (i) the current in the circuit, and…2023
- A resistor and an ideal inductor are connected in series to a 100 √2 V, 50 Hz ac source. When a voltmeter is connected across the resistor or the…2024
- A transformer is connected to a 200 V ac source. The transformer supplies 3000 V to a device. If the number of turns in the primary coil is 450, then…2025
- An alternating current I=14 sin (100 π t) A passes through a series combination of a resistor of 30 Ω and an inductor of (2/(5 π)) H. Taking √2=1.4,…2023
- Which of the following statements about a series LCR circuit connected to an ac source is correct?2023
- An inductor, a capacitor and a resistor are connected in series across an ac source of voltage. If the frequency of the source is decreased…2023
CBSE Class 12 Physics past-paper question from the 2024 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.