Question

What is the direction of magnetic field a point A above the wire carrying current I as shown in the adjoining figure ?

• A. Out of the page
• B. into the page
• C. up the page
• D. to the right
• E. down the page

Answer 1

The correct option is C up the page

Solution: As we know that, when current carrying wire is held vertically

and has current $di{r}^n$ in $+y$ and on the left of wire,

direction of magnetic field is out of the paper.

Now, wire is rotated clockwise and placed horizontally having

current in $+xdi{r}^n$. Now, the direction of magnetic field above

the wire is change from out of the paper to up the paper.

hence,

The correct opt : C