Questions
A wire of a certain material is stretched slowly by ten percent. Its new resistance and specific resistance become respectively
detailed solution
Correct option is B
Specific resistance ρ will remain same as it is the intrinsic property of material.Original resistance of the wire, R= ρlAor R= lA or R ∝ l2V as V= Aland R' ∝ l+10% l2VTherefore, R'R= l+10100 l2l2or R'R= 11l210l2 = 121100or R' =1.21 RTalk to our academic expert!
Similar 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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