Question

slove this question as must as fast possible

Answer 1

option 1 is correct
Use Right Hand thumb Rule to figure out direction of Magnetic field

Magnetic Field at a point due to finite wire is given by (ui(sina + sinb) / 4πr)

where r is perpendicular distance from that wire

Sina and b are angles made by perpendicular to the wire

you can easily find out that both 'a' and 'b' are 30° therefore Sina + sinb = 1

and r = √3/2 a = perpendicular bisector of A

plug these information into formula and you will get you answer

Notice that magnetic field due to other two sides will be 0

Hope it help you