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Two coaxial plane coils, each of n turns...

Two coaxial plane coils, each of n turns of radius a, are separated by a distance a. calcualte the magnetic field on the axis at the point midway between them when a current l flows in the same sense through each coil.
Electrons in a colou television tube are accelerated through a potential difference of 25 kV and then deflected by `45^(@)` in the magnetic field between the two coils described above. If a is 100 mm and the maximum current available for the coils is 2A, estimate the number of turns which the coils must have.

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Approximately 200 turns
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