Question

If the length of the wire is doubled then how many times the new resistance increases?

Answer 1

resistance is directly proportional to its length

therefore resistance will also get doubled

Answer 2

we know the relation between resistance and length , denoted by
R= p l /A. ( p- rho, l- length , A- area)
when
length is doubled

R' = p × 2l/A

R' = 2× p l/A

R' = 2× (R). [ :• R = p l/A]

hence, when length is doubled, resistance also gets doubled

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