Question

In fig. two long parallel wires carry equal currents in opposite directions. Point O is situated mid way between the wires and X - Y plane contains two wires and +ve Z - axis comes normally out of the plane of paper. The magnetic field B at O is non - zero along

• A. X Y and Z axes
• B. X - axis
• C. Y - axis
• D. Z - axis

Answer 1

The correct option is D Z - axis

$Solution:$ From Right hand rule, magnetic field at $O$ due to wire on the left is inside the paper and due to the wire on the right is also inside the paper.

Hence, no component of magnetic field is in $x$ or $y$ direction and the only remaining component is in $z$-direction.

$So,the$ $correct$ $option:D$