1.

Four very long straight wires carry equal electric currents in the +z direction. They intersect the x-y plane at (x,y)=(-a,0),(a,0),(0,a),(0,-a).The magnetic force exerted on the wire at position (-a,0) is along

Answer»

`+y`
`-y`
`+x`
`-x`

Solution :
`because""|vecF_(1)|=|vecF_(2)|`
`therefore` Their resultant will be ALONG `vecF_(3)` i.e.X-axis
So net force on WIRE sis along `+X` DIRECTION


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