Question

The current I is flowing in the wire which is kept horizontal on the $x$-axis as shown in the above figure. Find out the direction of the magnetic field due to the wire at point $P$?

• A. To the left
• B. To the right
• C. Into the page and perpendicular to the page
• D. Out of the page and perpendicular to the page
• E. Toward the bottom of the page

Answer 1

Answer: (D)

Out of the page and perpendicular to the page

The magnetic field around current carrying conductor is found by wrapping fingers around wire, where thumb points towards the current's direction.

Clearly from the figure, magnetic field at a point vertically above the wire is out of the plane.