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`        he resistance of a wire is 10 ohm. If it is streteched ten times, the resistance will readA) 1 ohm B) 10 ohm C) 100 ohm D) 1000ohm pls explain!THANKS!    `
one year ago

```							Dear student Aswe know R = (rho) L/A Now as L’ = 10 L hence new resistance will be 10 times of previous one = 10 * 10 = 100
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one year ago
```							Let the resistivity of wire be p.Let the length of wire be l.Let the area of cross-section of wire be A.Then the resistence of wire is given by R=p(l/A)  Assuming the wire to be cylindrical, the new length of wire br 10(l).The voume of wire remains constant.Let the new area of cross-section be A2. Now,πr2h=volume of cylinder.Also,πr2  =areaThus area*length=volume.A/q A*l=A2*(10 l)      A=10(A2)      A2=A/10Thus new resistence R2= p(10l)/A2                                  R2=p(10l)/(A/10)                                  R2= p(100l)A                                                                     =100(pl/A)                         Comparing it with original resistance  R2 =100R i.e. 100 ohm
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one year ago
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