Given below are two statements
**Statement I :** Biot-Savart's law gives us the expression for the magnetic field strength of an infinitesimal current element ($Idl$) of a current carrying conductor only.
**Statement II :** Biot-Savart's law is analogous to Coulomb's inverse square law of charge $q$, with the former being related to the field produced by a scalar source, $Idl$ while the latter being produced by a vector source, $q$.
In light of above statements choose the most appropriate answer from the options given below
Answer: (D) Statement I is correct and Statement II is incorrect
Statement I: the Biot-Savart law $d\vec{B} = \dfrac{\mu_0}{4\pi}\dfrac{I\,d\vec{l}\times\hat{r}}{r^2}$ gives the field of a small current element. Correct.
Statement II: both laws are inverse square laws, but the roles are swapped. The current element $I\,d\vec{l}$ is a vector source, while charge $q$ is a scalar source. Incorrect.
Solution by Sreeraj P, M.Sc Physics