Fig. shows two straight long wires insulated from each other along the axes x and y carrying equal current I. AB and CD are lines in the plane of the axes and at 45° with the axes. The magnetic field of the system is zero on the line :

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OB but not OA

CD but not OD

answer is A.

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Detailed Solution

The magnetic lines of force due to the two wires cancel each other and gives resultant zero magnetic field along the line AB

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