Question

.A conductor AB of length l carrying a current i is placed perpendicular to a long straight conductor XY carrying a current l, as shown. the force on AB will act

• A. along x to y
• B. along y to x
• C. to the right
• D. to the left

Answer 1

The correct option is A along x to y

$\overrightarrow{F}=i(\overrightarrow{l}\times \overrightarrow{B})$
Here, direction of $\overrightarrow{B}$ due to XY wire is into the paper at AB
So, $\overrightarrow{l}\times \overrightarrow{B}$ is towards X to Y. So, force is along X to Y direction.