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Two identical co-axial circular coil carry the same current I but in opposite direction. The magnitude of
magnetic field B at a point on the axis midway between the coil is
  • a)
    Zero
  • b)
    Same as that pr oduced by one coil
  • c)
    Twice that pro duced by one coil
  • d)
    Half that pro duced by one coil
Correct answer is option 'A'. Can you explain this answer?
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Two identical co-axial circular coil carry the same current I but in o...
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Two identical co-axial circular coil carry the same current I but in o...
Explanation:
When the two identical co-axial circular coils carry the same current I but in opposite directions, they produce equal and opposite magnetic fields.

At a point on the axis midway between the two coils, the magnetic field due to one coil will be in the opposite direction to that due to the other coil.

Therefore, the net magnetic field at this point will be zero.

Hence, the correct answer is option 'A', i.e., zero.

Conclusion:
The magnetic field at a point on the axis midway between two identical co-axial circular coils carrying the same current in opposite directions is zero.
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