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[" The resistance of three parts of a ci...

[" The resistance of three parts of a circular loop are as shown in figure.The magnetic field at the "],[" centre "O" is (current enters at "A" and leaves at "B" and "C" as shown ")],[qquad (1)/(18)],[qquad (1)/(120^(-1))],[(10)/(120^(-7))],[[" (C) "(mu_(0)I)/(3a)," (D) zero "]]

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