A metallic wire of resistance 20 ohm is stretched
Asked by admin @ in Physics viewed by 297 People
A metallic wire of resistance 20 ohm stretched until its length is doubled its resistance is
Answered by admin @
Since R=rho×L/A
We can see that R is directly proportional to L
Or if we substitute Las 2L (cause length is doubled)
We get...
R=rho×(2L)/A
R=2×rho×L/A
So R will be doubled...and now the value of R will be 2×20=40ohm
Hope this helps
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