Question

A current carrying wire is placed horizontally and has a current flow to the right. What is the direction of the magnetic field at point p?

• A. Points to the right
• B. Points to the left
• C. Points to the top of the page
• D. Points to the bottom of the page
• E. Points out of the page

Answer 1

The correct option is C Points to the top of the page

Given: A horizontal wire carrying current I to the right.

Solution: We use here Right hand thumb rule,

which state that, hold a straight current carrying conductor in such a way that extended thumb points out in the $di{r}^n$

of current flow then the direction of curl of fingers shows the $di{r}^n$ of magnetic field.

According to this, in our problem,

current $di{r}^n$ is in +ve x direction as it placed horizontally,

also the point P is placed above the current carrying wire which concludes that the $di{r}^n$ of magnetic field is point

to the top of the page on applying right hand thumb rule.

hence,

The correct opt: C