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Two identical circular coils of conducti...

Two identical circular coils of conducting wire, each of radius 4 cm and having 10 turns are placed on a common axis and their centres are 6 cm apart. If a current of 1 A flows in each coil in opposite directions, find the magnitude of magnetic induction.
(i) At the centre of one of the coils.

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At a point midway on the common axis, the magnetic inductions due to the two coils are equal but have directions opposite to each other. Therefore, magnitude of the net induction is zero i.e. `vec B_(2) = 0`.
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VMC MODULES ENGLISH-MOVING CHARGES & MAGNETISM -Illustration
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