A) \[\overrightarrow{B}\bot \overrightarrow{v}\]
B) \[\overrightarrow{B}\parallel \overrightarrow{v}\]
C) it obeys inverse cube law.
D) it is along the line joining the electron and point of observation.
Correct Answer: A
Solution :
(a) \[\overrightarrow{B}\bot \overrightarrow{v}\] Magnetic field produced by charges moving with velocity \[\overrightarrow{v}\] at a distance r is \[\overrightarrow{B}=\left( \frac{{{\mu }_{0}}}{4\pi } \right)\cdot q\frac{\overrightarrow{v}\times \widehat{r}}{{{r}^{2}}}\]. Therefore \[\overrightarrow{B}\bot \overrightarrow{v}\].
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