Question

Horizontal component of earth's magnetic field at a place is uniform and its direction is from south to north. A high current through a horizontal power line flows at this place from east to west,Consider two points A and B at equal distances from wire,respectively above and below it.Giving reason explain where is the field more at-A or B

Answer 1

Answer:

Explanation:

According to Right Hand Thumb Rule the direction of magnetic field due to current at a is from north to south and at be from South to North therefore at a field and field due to current are in opposite direction where as at be they are in the same direction so field is more at b

Answer 2

Answer:

Refer to the image

Explanation:

So as you can see in the diagram at point "a" the magnetic field due to coil is opposite to the horizontal present magnetic field.

so the net magnetic field is less there.

but at point b the magnetic field adds up.

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