✓ 3 MARKS
Derivations
🔥 APPEARED IN 3 BOARD SETS
(a) Depict the variation of electric field (\vec{E}) and magnetic field (\vec{B}) with respect to the direction of propagation of an electromagnetic wave. Write their two important characteristics. (b) Show that \frac{1}{\sqrt{\varepsilon_0 \mu_0}} gives the velocity of an electromagnetic wave in free space.
01 // VERIFIED BOARD OCCURRENCES
| Year | Paper Code | Set | Position |
|---|---|---|---|
| CBSE 2026 | Series 55-3 | Set 1 | Question 25 |
| CBSE 2026 | Series 55-3 | Set 2 | Question 26 |
| CBSE 2026 | Series 55-3 | Set 3 | Question 22 |
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)