Question

A wire is strerched by 10% of its initial length then calculate the percentage change in it's resistance???

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Answer 1

Answer:

on stretching wire it will become long and narrow .and we know that resistance increases 2 times in each case

so if 10% of initial length is changed then resistance will be increased by 20 percent(10 for length and 10 for narrowing)

and ha follow krna zruri ni hai..