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Two similar coaxial coils, separated by ...

Two similar coaxial coils, separated by some distance, carry the same current I but in opposite directions. The magnitude of the magnetic field B at a point on the axis at the mid point of the line joining the centre is :

A

zero

B

the same as that produced by one coil

C

twice that produced by one coil

D

half of that produced by one coil

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The correct Answer is:
A
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