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Equal currents are flowing in three infi...

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)

A

`(mu_0i)/(2pia)(hatj-hati)`

B

`(mu_0i)/(2pia)(hati-hatj)`

C

`(mu_0hati)/(2pia)(hati+hatj)`

D

`(mu_0i)/(2pia)(-hati-hatj)`

Text Solution

Verified by Experts

The correct Answer is:
A
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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