Q.

Two similar co-axial 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 center is

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a

zero

b

the same that produced by one coil

c

twice that produced by one coil

d

half of that produced by one coil

answer is A.

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Detailed Solution

The direction of field due to one coil is opposite to the other coil.Due to symmetry , magnitude of both fields is same.Hence, B→net = B→1+B→2 =B-B= 0
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