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12.A metallic wire of resistance R is cut into 10 parts of equallength. Two pieces each are joined in series and then five suchcombinations are joined in parallel. What will be the effectiveresistance of this combination.

Answer»

Resistance of 10 equal parts = 1/10Rresistance of two 1/10 parts joined in series = 1/5Rlet equivalent resistance be Rp1/Rp = 1/1/5R*51/Rp = 25RRp = 1/25R



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