Two concentric coils X and Y of radii 16 cm and 10 cm lie in the same vertical plane containing N-S direction. X has 20 turns and carries 16 A. Y has 25 turns and carries 18 A. X has a current in the anti-clockwise direction and Y has a current in the clockwise direction, for an observer, looking at the coils, facing the west. The magnitude of the net magnetic field at their common centre is:
5 * 10-4 T towards west
13 * 10-4 T towards east
13 * 10-4 T towards west
5 * 10-4 T towards east
For
For
Net magnetic field = YB - XB = 9 * 10-4 - 4
* 10-4
= 5 * 10-4 T (West)
(YB is superior. So, the direction is along the west.)
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