✓ 3 MARKS
Derivations
🔥 APPEARED IN 3 BOARD SETS
(a) Using a phasor diagram, derive an expression for the impedance of a series LCR circuit connected to an ac source. What is meant by resonance in this circuit ? Obtain expression for the resonant frequency of this circuit.
01 // VERIFIED BOARD OCCURRENCES
| Year | Paper Code | Set | Position |
|---|---|---|---|
| CBSE 2026 | Series 55-7 | Set 1 | Question 32 |
| CBSE 2026 | Series 55-7 | Set 2 | Question 31 (a) |
| CBSE 2026 | Series 55-7 | Set 3 | Question 33 |
02 // OFFICIAL CBSE MARKING SCHEME BREAKDOWN
- Step 1: Stating the fundamental formula / law statement (+1 Mark)
- Step 2: Intermediate mathematical substitution or proof steps (+1 Mark)
- Step 3: Correct final value or conclusion with mandatory SI units (+1 Mark)