It is found that a non-zero current element i | vedclass

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(B) According to the Biot-Savart Law,the magnetic field $dB$ produced by a current element $Id\vec{l}$ at a position vector $\vec{r}$ is given by:$dB

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may be $0^{\circ}$ or $180^{\circ}$

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(B) According to the Biot-Savart Law,the magnetic field $dB$ produced by a current element $Id\vec{l}$ at a position vector $\vec{r}$ is given by:$dB = \frac{\mu_0}{4\pi} \frac{I(d\vec{l} 	imes \vec{r})}{r^3} = \frac{\mu_0}{4\pi} \frac{Idl r \sin 	heta}{r^3}$where $	heta$ is the angle between the current element $Id\vec{l}$ and the position vector $\vec{r}$.For the magnetic field $dB$ to be zero,the term $\sin 	heta$ must be zero.This occurs when $	heta = 0^{\circ}$ or $	heta = 180^{\circ}$.Therefore,the angle between the current element and the position vector is $0^{\circ}$ or $180^{\circ}$.

It is found that a non-zero current element is unable to produce any magnetic field at a particular point. Then the angle between the current element and the position vector of that point with respect to the current element is

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