Question

Magnetic field at point '$P$' due to given current distribution :-

• A. $\frac{{\mu }_{0}I}{4\pi a}\odot$
• B. $\frac{{\mu }_{0}I}{2\pi a}\odot$
• C. $\frac{{\mu }_{0}I}{\pi a}\otimes$
• D. Zero

Answer 1

Answer: (B)

Due to segment $1\&3B=0$
Due to $2\&4=\frac{{\mu }_{0}I}{4\pi a}\odot +\frac{{\mu }_{0}I}{4\pi a}\odot$
$B_{\text{net }P}=\frac{{\mu }_{0}I}{2\pi a}\odot$