1.

In previous problem, if the current is I and the magnetic field at D has magnitude B, then

Answer»

`B=(mu_0I)/(2sqrt2pi)`
`B=(mu_0I)/(2sqrt3pi)`
B is parallel to the z-axis
B makes an ANGLE of `45^@` with the x-y plane

Solution :The magnitude of the magnetic FIELD DEPENDS only on the DISTANCE
from the x-axis. Point A and C are at distance of 1 unit each
from the x-axis. Points B and D are at distance of `sqrt2` unit each
from the x-axis. Magnetic field at point D,
`B=(mu_0I)/(1sqrt2pi)`
It is obvious that B is INCLINED at an angle of `45^@` with the
x-y plane.


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