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(A) The $Biot-Savart$ Law describes the magnetic field generated by a constant electric current. It relates the magnetic field $dB$ at a point to the

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Biot-Savart Law

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(A) The $Biot-Savart$ Law describes the magnetic field generated by a constant electric current. It relates the magnetic field $dB$ at a point to the current $I$,the length element $dl$,and the distance $r$ from the current element. Mathematically,it is expressed as $dB = \frac{\mu_0}{4\pi} \frac{I dl \sin	heta}{r^2}$. Therefore,the $Biot-Savart$ Law is the fundamental law used to determine the magnetic field produced by a current-carrying conductor.

Which law is useful to determine the relation between current and the magnetic field produced by it?

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