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  4. A cylindrical copper rod is reformed to twice its original length with no change in volume. The resistance between its ends before the change was R. Now its resistance will be :

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Q. A cylindrical copper rod is reformed to twice its original length with no change in volume. The resistance between its ends before the change was $R$. Now its resistance will be :

Current Electricity

Solution:

As length is increased to double that means for the constant volume its cross sectional area will decrease to half so its resistance will become four times.