1.

An electrical wire double on its self what will be the change in resistance

Answer»

We have

Resistance= RESISTIVITY x LENGTH/area

When the wire is stretched to double the length , the area of CROSS SECTION GETS reduced to half.

So

New Resistance = Resistivity x 2length/area/2

I.e,

New resistance = (Resistivity x area/length)x4

i.e, New resistance = Resistance x 4

So when the wire is stretched, the resistance multiplies by four times.



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