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A current I flows through an infinitly l...

A current I flows through an infinitly long wire having infinite brands as shown. The radius of the first curved section is a and the radii of the successive curved portions each increases by a factor `eta`. Find magnetic field at O.

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`B = ((mu_0 itheta)/(2 pia))/(1 + 1/eta)=(mu_0 itheta eta)/(4 pi a(eta + 1))`
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