Question

In the figure shown, the magnetic field induction as the point $O$ will be

• A. $\frac{\mu_{0}i}{2 \pi r }$
• B. $\left(\frac{\mu_{0}}{4\pi}\right) \left(\frac{i}{r}\right) \left(\pi+2\right)$
• C. $\left(\frac{\mu_{0}}{4\pi}\right) \left(\frac{i}{r}\right) \left(\pi+1\right)$
• D. $\frac{\mu_{0}}{4\pi} \frac{i}{r} \left(\pi -2 \right)$

Answer 1

Answer: (B)

$\left(\frac{\mu_{0}}{4\pi}\right) \left(\frac{i}{r}\right) \left(\pi+2\right)$

Answer 2

Field due to a straight wire of infinite length is $\frac{\mu_{0} i}{4 \pi r}$ if the point is on a line perpendicular to its