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Physics · 2023 · 1 mark
CBSE 2023 · Region 2 · Set 1 · Q6
A long straight wire of radius 'a' carries a steady current ' I '. The current is uniformly distributed across its area of cross-section. The ratio…
A long straight wire of radius 'a' carries a steady current ' $\displaystyle I$ '. The current is uniformly distributed across its area of cross-section. The ratio of magnitude of magnetic field $\displaystyle \overrightarrow{\mathrm{B}}_{1}$ at $\displaystyle \frac{\mathrm{a}}{2}$ and $\displaystyle \overrightarrow{\mathrm{B}}_{2}$ at distance $\displaystyle 2$ a is
Official answer
(B)
$\displaystyle 1$
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CBSE Class 12 Physics past-paper question from the 2023 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.