Question

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Q :- The Length of a conductor became twice keeping it's volume unchanged. The initial resistance of the wire is 10 ohm. What will be it's final resistance ?

• What do you mean by conductivity of a conductor ?

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Answer 1

fffAs a wire gets longer its resistance increases, and as it gets thinner its resistance also increases because its cross sectional area decreases. Doubling the length will double the resistance, but the wire also must get thinner as it is stretched, because it will contain the same amount of metal in twice the length.ff

Answer 2

Proving->

Conductivity of a conductor is the reciprocal of electrical resistivity, and measures a material's ability to conduct an electric current. It is commonly represented by the Greek letter σ (sigma)