Question

Which one of the following options represents the magnetic field $\vec{B}$ at $O$ due to the current flowing in the given wire segments lying on the $x y$ plane?

• A. $\vec{B}=\frac{-\mu_0 I}{L}\left(\frac{3}{2}+\frac{1}{4 \sqrt{2} \pi}\right) \hat{k}$
• B. $\vec{B}=-\frac{\mu_0 I}{L}\left(\frac{3}{2}+\frac{1}{2 \sqrt{2} \pi}\right) \hat{k}$
• C. $\vec{B}=\frac{-\mu_0 I}{L}\left(1+\frac{1}{4 \sqrt{2} \pi}\right) \hat{k}$
• D. $\vec{B}=\frac{-\mu_0 I}{L}\left(1+\frac{1}{4 \pi}\right) \hat{k}$

Answer 1

Answer: (C)

$\overrightarrow{ B }=\frac{\mu_0 I }{4 \pi L } \sin 45^{\circ}(-\hat{ k })+\frac{\mu_0 I \pi}{4 \pi \frac{ L }{2}}(-\hat{ k })+\frac{\mu_0 I }{4 \pi \frac{ L }{4}} \times \frac{\pi}{2}(-\hat{ k })$