Question

a wire has length l are a and resistence r ...then what will happen to its resistence when length is made 3 times and area is one third
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Answer 1

Answer:

When the wire is stretched to 3 times its original length, its cross section is also reduced to one third of what it was before. By using the above relation, we find the new resistance to be 3x3= 9 times of what it was before!