An electric current passes through a straight wire. Magnetic compasses are placed at the points X and Y.
A Their needles will not deflect.
B Only one of the needles will deflect.
C The needles will deflect in the same direction.
D The needles will deflect in the opposite directions.
Ans 1: (Master Answer)
The correct answer is D
Current carrying wire produces magnetic field, but direction of magnetic field on the given points X and Y are different.
This is found by right hand thumb rule. So magnetic compasses on X and Yexperience magnetic force of same magnitude but in opposite directions. Hence, the needles will deflect in opposite directions.