Question

the resistance of wire is R ohm..if it is melted and streched to n times its original length its new resistance will be

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Answer 1

To understand my answer you have to understand the basic formulas of electricity first..

Here goes ur answer:-

As learnt in

Resistance formula -

See the attachment

- wherein

rho = resistivity of material

n= Number of free electrons per unit volume.

To solve it see the attachment

So the answer is n^2

Answer 2

Answer:

rho = resistivity of material

n= Number of free electrons per unit volume.

Resistance formula -

Resistance formula -See the attachment

To solve it see the attachment So the answer is n^2