A copper wire of diameter 1cm has resistance of 0.15ohms . It wae drawn under pressure so that it's diameter was reduced to 50% then what is new series
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ans will be 2.4
volume will be same as wire is stretched so area × length = constant
in this area is decreased 4 times so length will increase 4 times and by applying formula of resistance 4×4×0.15=2.4
Explanation:
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