Q. If a wire is stretched to double its length, its resistance becomes

यदि किसी तार को उसकी लंबाई से दोगुना तक खींच दिया जाए तो उसका प्रतिरोध हो जाता है

4R
4आर

R/2
आर/2

R
आर

2R
2आर

Stretching a wire doubles its length and reduces its area (since volume stays constant).
New resistance:

R^{'} = ρ \frac{(2 L)}{(A / 2)} = 4 R

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