The ratio of magnetic field at the centre of a current carrying coil of radius r to the magnetic field at distance r from the centre of coil on its axis is 
: 1. The value of x is_____.
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The formula to calculate the magnetic field at any axial point situated at a distance x from the center of a circular current carrying conductor of radius r can be written as B= Mo/r2 3/2 ...
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Substitute 0 for x in equation to calculate the magnetic field (B c ) at the center of the conductor.
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Substitute r for x in equation to calculate the magnetic field (B c ) at the given distance from the center of the conductor.
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Divide equation by equation to calculate the required ratio of the magnetic fields.
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