Question

For given current distribution, each infinite length wire produces magnetic field $B$ at origin their resultant magnetic field at origin $O$ is:

• A. $4B$
• B. $\sqrt{2}B$
• C. $2\sqrt{2}B$
• D. Zero

Answer 1

The correct option is C $2\sqrt{2}B$

2B along positive x axis

2B along positive y axis

their resultant is $\sqrt{(2B{)}^2+(2B{)}^2}=2\sqrt{2}B$