Question

magnetic field at point O ​

Answer 1

Answer:

2r is the ans. i"m not conform

Answer 2

Given :

A figure is given to us .

To Find :

We need to find the magnetic field at the center O .

Solution :

We know , magnetic filed at the center of arc of x radians is given by :

$B=\dfrac{\mu_o(x I)}{4\pi r}$

Now , for semicircle , $x=\pi$ .

For quarter circle , $x=\dfrac{\pi}{2}$ .

Let , us assume clockwise direction is positive and anti-clockwise direction is negative .

Therefore ,

$B_{net} =\dfrac{\mu_o (\dfrac{\pi}{2}) I}{4\pi R}+\dfrac{\mu_o (\dfrac{\pi}{2} )I}{4\pi( 2R)}-\dfrac{\mu_o (\pi) I}{4\pi (3R)}\\\\B_{net}=\dfrac{3\mu_oI}{13R}$

Hence , this is the required solution .

Learn More :

Magneto statics

https://brainly.in/question/15968086