# pls explain (iii)

(iii)

From BIOT-SAVART LAW magnetic field due to source

*idl*is given by

$d\overrightarrow{B}=\frac{{\mu}_{0}}{4\pi}\frac{i\overrightarrow{dl}\times \overrightarrow{r}}{{r}^{3}}$

which linearly dependent on source of magnetic field

*idl*

â€‹Electric field due to a point charge is given by

$E=\frac{1}{4\pi {\epsilon}_{0}}\frac{Q}{{r}^{2}}$

which linearly depend on the source of filed Q

Regards

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