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Subject :NSO    Class : Class 10

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)

Class : Class 1

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.

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