Question

hlo guyss.... my question is if a copper wire of ressistance R is stretched to double its length. find the new resistance. plz answer in detail​

Answer 1

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 length/area)x4

i.e, New resistance = Resistance x 4

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

Answer 2

Answer:

HII MATE

HERE'S THE ANSWER

Explanation:

Since Volume = Area x length, given that length has increased two times, the area will be halved. Resistance is proportional to Length/Area. Thus resistance increases by 4. The new resistance would be 4 Ohms.

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