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Statement of a problem № 3825

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A long wire is bent into the shape as in Fig. 13.9, without any cross-contact at P. The current flows as indicated with the circular portion having radius R. Show that the magnetic induction at C, the centre of the circle is B = n0i/2R(1+1/pi)

Solution:
A long wire is bent into the shape as in Fig. 13.9, without any cross-contact at

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