Question

A wire PQ carries a current 'i' placed perpendicular to a long wire XY carrying a current I. The direction of force on PQ will be:-

• A. towards right
• B. towards left
• C. upwards
• D. downwards

Answer 1

Answer: (D)

downwards

Direction of force =Direction of $i\hat{L}\times \hat{B}$

Now direction of Magnetic field will be calculated by right hand Thumb rule. According to Right and thumb rule our our fingure will move in anticlockwise direction Then our thumb will direct downward hence, direction of force will be downward

Correct option is D.