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Two identical conducting wires AOB and C...

Two identical conducting wires `AOB and COD` are placed at right angles to each other. The wire `AOB` carries an electric current `I_(1) and COD` carries a current `I_(2)`. The magnetic field on a point lying at a distance `d` from O, in a direction perpendicular to the plane of the wires `AOB and COD`, will be given by

A

`(mu_(0))/(2pid)((l_(1))/(l_(2)))`

B

`(mu_(0))/(2pid)(l_(1)+l_(2))`

C

`(mu_(0))/(2pid)(l_(1)^(2)-l_(2)^(2))`

D

`(mu_(0))/(2pid)(l_(1)^(2)+l_(2)^(2))^(1//2)`

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The correct Answer is:
d
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