engineering recuitment UPCL AE (E&M) 2021 Mock Test Physics Moving Charges and Magnetism Biot-Savart Law
Vector form of Biot-savart's law is
1
\(\overrightarrow {dB} = \frac{{{\mu _o}}}{{4\pi }}i\left( {\frac{{\overrightarrow {dl} \times \vec r}}{r}} \right)\)
2
\(\overrightarrow {dB} = \frac{{{\mu _o}}}{{4\pi }}{i^2}\left( {\frac{{\overrightarrow {dl} \times \vec r}}{r}} \right)\)
3
\(\overrightarrow {dB} = \frac{{{\mu _o}}}{{4\pi }}{i^2}\left( {\frac{{\overrightarrow {dl} \times \vec r}}{{{r^2}}}} \right)\)
4
\(\overrightarrow {dB} = \frac{{{\mu _o}}}{{4\pi }}i\left( {\frac{{\overrightarrow {dl} \times \vec r}}{{{r^3}}}} \right)\)