A Wire of resistivity 10 ohm meter is stretched to double its length.What is its new resistance?
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it should be 40ohms . as the length increases the resistivity = +2times the initial one. Also, it becomes 2times thinner , hence the resistance will again increase by +2times .
= 2×2×10 = 40Ω
The Resistivity of the wire will not change with the change in length. Resistivity is a property of the wire, it doesn't depend upon it's length or cross-sectional area. However, If you are asking about Resistance, it will increase to 4 times it's initial value.
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