Question

A constant current I flows in a horizontal wire
in the plane of the paper from west to East
. The direction of .magnetic field at a point will be South to North
1 . directly above the wire
2. directly below the wire
3. at a point located in the plane of the paper,
on the north side of the wire
4. at a point located in the plane of the paper,
on the south side of the wire

Answer 1

Answer:

directly above the wire

Answer 2

$\bf\huge\underline\mathtt\green{Answer}$

(b) Directly below the wire

As per right hand thumb rule, when conductor is held in right hand, keeping thumb east to west, then curve of the finger will be from north to south at a point lying directly below the wire.