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Statement of a problem № 3824

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(a) C is the common centre of the circular arcs of the circuit-carrying current i , its arcs cutting a sector of angle, T . Show that the magnetic induction at C is B=n0iT/4pi(1/R1-1/R2) (b) C is the common centre of the semicircular arc of radii R1 and R2 , Fig. 13.8, carrying current i . Show that the magnetic induction at C is B=n0i/4(1/R1-1/R2)

Solution:
(a)  C is the common centre of the circular arcs of the circuit-carrying current

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