Questions
Two conductors, both having same length and same area of cross-section are joined in series. Their materials are different and resistivity of one of them is . If equivalent resistivity of their combination is 3 , resistivity of the other conductor is :
detailed solution
Correct option is D
Req=R1+R2⇒3ρ2lA=ρlA+ρ1lA⇒ρ1=5 ρTalk to our academic expert!
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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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