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Physics · 2026 · 1 mark
CBSE 2026 · Region 1 · Set 2 · Q9
A straight conductor lies along x -axis. It carries a current of 10 A along +x direction. The magnetic field B due to 1 cm segment of this conductor,…
A straight conductor lies along $\displaystyle x$-axis. It carries a current of $\displaystyle 10$ A along $\displaystyle +x$ direction. The magnetic field $\displaystyle \overrightarrow{\mathrm{B}}$ due to $\displaystyle 1$ cm segment of this conductor, centred at the origin, at a point ($\displaystyle 0$, $\displaystyle 1$ m, $\displaystyle 0$) is
Official answer
(B)
$\displaystyle (10 \mathrm{nT}) \hat{\mathrm{k}}$
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CBSE Class 12 Physics past-paper question from the 2026 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.