Question

if L (length) of conductor is doubled how will it affect resistivity?​

Answer 1

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If L (length of conductor) is doubled, it will not affect resistivity.

As Resistivity has no relation with length.

But

Resistance will be doubled if Length is doubled

as

R is directly proportional to L

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...Hope it helps....

Answer 2

Answer:

So, R = þ × l / A __(i)

When length of resistor is doubled then,

R' = þ × 2l / A __(ii)

By dividing both equations

R' / R = ( þ × 2l / A ) × ( A × 1 / þl )

R' / R = 2 or R' = 2 × R

Hence the new resistance will be double of initial one.

Conclusion :

In directly proportional values, when length will be doubled then Resistance will also double but when area will double the resistance will be reduced to half.