and 
of
radii 
and 
,
respectively, lie in the same vertical plane containing the north to south
direction. Coil has 20 turns
and carries a current of 16 A : coil has 25 turns
and carries a current of 18 A. The sense of the current in is
anticlockwise, and clockwise in , for an
observer looking at the coils facing west. Give the magnitude and direction of
the net magnetic field due to the coils at their centre.
Answer:
Coil 
Using 
we get
i.e., 
towards
east.
Coil 
towards west
Net field 
towards west.
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