Biot-savart Law

The Biot-Savart Law gives the magnetic field ( $d B$ ) due to a steady current element $I d l$ at a point with position vector $r$ : $d B = \frac{μ _{0}}{4 π} \frac{I ( d l \times r ^ )}{r ^{2}}$

In magnitude: $d B = \frac{μ _{0}}{4 π} \frac{I d l s i n θ}{r ^{2}}$
$θ$ is the angle between the current element ( $I d l$ ) and the position vector ( $r$ ) from the element to the point of observation.

This easy difficulty physics question is from the chapter magnetic effects of current and magnetism, covering the topic of biot-savart law. It appeared in the 2025 exam.

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Biot-savart Law

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