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Statement of a problem № 3821

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(a) A current I is sent through a thin wire as in Fig. 13.6. The straight wires are very long and the radius of the curved part of the wire is R. Show that the magnetic induction at the point O will be B=n0i/2piR(pi+2) (b) A wire shown in Fig. 13.7 carries current I . Find the field of induction B at the centre O.

Solution:
(a)  A current I is sent through a thin wire as in Fig. 13.6. The straight wires

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