A) \[\overrightarrow{\delta B}=\frac{KI\overrightarrow{\delta \ell }\times \vec{r}}{{{r}^{3}}}\]
B) \[\overrightarrow{\delta B}=\frac{KI\overrightarrow{\delta \ell }\times \hat{r}}{{{r}^{2}}}\]
C) \[\overrightarrow{\delta B}=\frac{KI\delta \ell \sin \theta }{{{r}^{2}}}\hat{n}\]
D) \[\overrightarrow{\delta B}=\frac{KI\delta \ell \sin \theta }{{{r}^{2}}}\hat{r}\]
Correct Answer: D
Solution :
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