(Answered) A coil of radius 75 mm has 250 turns and carries a current

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A coil of radius 75 mm has 250 turns and carries a current of 2.2 A. Find the magnetic field at the centre of the coil and at a point along the axis 150 mm along the coil. How far along the axis must you go to find the magnetic field has dropped to half its value at the centre of the coil?

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