Same current i is flowing in the three i...

Same current i is flowing in the three infinitely long wires along positive x-,y- and z-directions. The magnetic filed at a point (0,0,-a) would be

`(mu_(0)i)/(2pia)(hatj-hati)`

`(mu_(0)i)/(2pia)(hati+hatj)`

`(mu_(0)i)/(2pia)(hati-hatj)`

`(mu_(0)i)/(2pia)(hati-hatj+hatk)`

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