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[" A uniform wire of resistance "20],[" ...

[" A uniform wire of resistance "20],[" ohm having resistance "1Omega/m" is "],[" bent in the adjoining form of a "],[" circle as shown in the figure.If "],[" the equivalent resistance "],[" between "M" and "N" is "1.8Omega," then "],[" the length of the shorter section "],[" is: "],[[" (a) "2m," (b) "5m],[" (c) "1.8m," (d) "18m]]

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