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Two parallel Co-axial Coils of equal rad...

Two parallel Co-axial Coils of equal radius R and- numbers of turn N carrying equal currents I in same direction.are separated by a distance | R. Show that the magnetic field intensity B on the axis around the mid point between the coils is uniform over a very small distance as compared to R and is given by-
`B = (4/5)^(3/2) (mu_0IN)/R`

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R G PUBLICATION-MOVING CHARGES AND MAGNETISM-EXERCISE
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