✓ 1 MARKS
MCQ
🔥 APPEARED IN 3 BOARD SETS
Two infinitely long straight conductors lie along x-axis and y-axis in the plane of the page. If they carry current I each along $+x$-axis and $+y$-axis respectively, the net magnetic field at a point with position vector $\vec{r} = (3\hat{i} + 4\hat{j})\text{ m}$ will be :
A
$\frac{\mu_0 I}{6\pi}\hat{k}$
B
$-\frac{\mu_0 I}{12\pi}\hat{k}$
C
$-\frac{\mu_0 I}{24\pi}\hat{k}$
D
$\frac{\mu_0 I}{48\pi}\hat{k}$
01 // VERIFIED BOARD OCCURRENCES
| Year | Paper Code | Set | Position |
|---|---|---|---|
| CBSE 2026 | Series 55-7 | Set 1 | Question 3 |
| CBSE 2026 | Series 55-7 | Set 2 | Question 7 |
| CBSE 2026 | Series 55-7 | Set 3 | Question 8 |
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)