Question

A wire is streched to increase its length by 5% . calculate % change is the ristance​

Answer 1

Answer:

resistance would also increase by same percent

Answer 2

Answer:

10.25%

Explanation:

When a wire is stretched, its volume remain constant hence

l1A1=l2A2=V, the volume

Now R1=ρl1A1=ρl1×l1l1A1=ρl21V , i.e. R1∝l21

Hence

or R2=1.1025R1

∴% change in resistance

=(R2−R1R1)×100=(R2R1−1)×100

=(1.1025−1)×100=10.25%

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