Question

An infinite wire bent in the form of $L$ carries current $I$.
What is the magnetic field at the point $O$?

• A. Zero
• B. $\frac{{\mu }_0}{4\pi }\times \frac{I}{d}$
• C. $\frac{{\mu }_0}{4\pi }\times \frac{I}{2d}$
• D. $\frac{{\mu }_0}{4\pi }\times \frac{2I}{d}$

Answer 1

The correct option is A Zero

We know that magnetic field due to current carrying infinite wire will be (B)=$\frac{\mu i}{4\pi r}$.
In the given figure magnetic field due to both the wire at the point of intersection will be "ZERO" hence the "O" point is an imaginary point which is really exist at intersection point of wire.
so "O" which is in space will have "zero" magnetic field.