Question

To obtain maximum intensity of magnetic field at a point the angle between position vector of point and small elements of length of the conductor is

• A. 0
• B. $\pi /4$
• C. $\pi /2$
• D. $\pi$

Answer 1

Answer: (C)

$\pi /2$
The Biot Savart law is used for computing the resultant magnetic field at position generated by a steady current I. According to it $B=\frac{{\mu }_{0}I}{4\pi }\int \frac{I\overrightarrow{dl}\times \overrightarrow{r}}{r^3}$.

So to obtain maximum intensity of magnetic field at a point the angle between position vector of point and small elements of length of the conductor is $\pi /2$.