Questions
The masses of the three wires of copper are in the ratio 1 : 3 : 5. And their lengths are in the ratio 5 : 3 : 1. The ratio of their electrical resistance is
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Correct option is D
R=ρlA=ρl2Al=ρl2V=ρl2m/d=ρdl2m or R∝l2mR1:R2:R3=l12m1:l22m2:l32m3=251:93:15=125:15:1Similar Questions
In an electrical cable there is a single wire of radius 9 mm of copper. Its resistance is 5Ω . 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
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