if the length of wire becomes2x ,what happens to the resistance?
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R= p l/ A
Al = A' L' = V
A' = Al / 2 l
A' = A/ 2
R' = p L' / A'
R ' = p 2 x 2 l / A
R' = 4 R
Al = A' L' = V
A' = Al / 2 l
A' = A/ 2
R' = p L' / A'
R ' = p 2 x 2 l / A
R' = 4 R
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