Discuss special cases of Biot-Savart law.
Discuss special cases of Biot-Savart law.
$(1)$ If $\theta=0^{\circ}, \sin 0^{\circ}=0$, so that $d \mathrm{~B}=0$ i.e. the magnetic field is zero at points on the axis of the current element.
$(2)$ If $\theta=90^{\circ}, \sin 90^{\circ}=1$ so that $d \mathrm{~B}=$ is maximum. i.e. the magnetic field due to a current element is maximum in a plane passing through the element and perpendicular to its axis.
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