The resistance of a wire is R ohm.. if it is melted and streched to n times its original length, its new resistance will be?
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Explanation:
We know that volume has to remain constant if a wire is stretched.
Let length and area of wire be l1, A1 before stretching and l2, A2 after stretching respectively.
l1*A1=l2*A2
Hence, new length is n*old length, and area is Old area/n
Now, resistance is proportional to ratio of length and area.
Hence,new resistance is n*n*R
Hope you understood
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