Two infinitely long, thin, insulated, straight wires lie in the x-y plane along the x- and y- axis respectively. Each wire carries a current I, respectively in the positive x-direction and positive y-direction. The magnetic field will be zero at all points on the straight line:

Options

A. `y=x`
B. `y=-x`
C. `y=x-1`
D. `y=-x+1`

Answer

A

Explanation

`(mu_(0)i)/(2pix)=(mu_(0)i)/(2piy)`
`y=x`
only in first and third quadrant the fields will be oppositely directed.