1.

Equal currents are flowing in three infinitely long wires along positive x,y and z -directions. The magnetic field at a point (0,0-a) would be (i=current in each wire)

Answer»

`(mu_0i)/(2pia)(hatj-HATI)`
`(mu_0i)/(2pia)(hati-hatj)`
`(mu_0hati)/(2pia)(hati+hatj)`
`(mu_0i)/(2pia)(-hati-hatj)`

SOLUTION :MAGNETIC FIELD DUE to current in the wire along z-axis is zero. Magnetic field due to wire along x-axis is along hatj direction and magnetic field due to wire along y-axis is along `-hati` direction. Both wires produce
`B=mu_0/(2pi) i/a`


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