Magnetic Field due to a Current — Physics STD 11 Science — Question

At point P, i = 0, Thus B = 0

At point R, i = 0, B = 0

At point $\theta,$

Applying ampere’s rule to the above rectangle

$\text{B}\times2\text{l}=\mu_0\text{K}_0\int\limits_\text{o}^\text{l}\text{dl}$

$\text{B}\times2\text{l}=\mu_0\text{Kl}\Rightarrow\text{B}=\frac{\mu_0\text{K}}{2}$

$\text{B}\times2\text{l}=\mu_0\text{K}_0\int\limits_\text{o}^\text{l}\text{dl}$

$\text{B}\times2\text{l}=\mu_0\text{Kl}\Rightarrow\text{B}=\frac{\mu_0\text{K}}{2}$

Since the $\overrightarrow{\text{B}}$ due to the 2 stripes are along the same direction, thus.

$\text{B}_\text{net}=\frac{\mu_0\text{K}}{2}+\frac{\mu_0\text{K}}{2}=\mu_0\text{k}$