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a wire of resistance 4 ohm is streched to thrice its orginal length.find its new resistance

If we increase lenght n times,its resistance is increased by n2 times...

resistance is 9R=9 x 4 =36 ohms

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36 ohm
Explanation:
If length stretched 3 times ,area of cross section decreased by 3 times and resistance is proportional to length and inversely proportional to area of cross section
So
4*9 =36
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