NEET Physics Current Electricity Questions Solved


In an electrical cable there is a single wire of radius 9 mm of copper. Its resistance is 5 Ω. The cable is replaced by 6 different insulated copper wires, the radius of each wire is 3 mm. Now the total resistance of the cable will be 

(1) 7.5 Ω

(2) 45 Ω

(3) 90 Ω

(4) 270 Ω

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