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A resistance of a wire has a value or (r) Ohms. The wire is stretched to double its length, then, its resistance in Ohms is:
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A resistance of a wire has a value or (r) Ohms. The wire is stretched to double its length, then, its resistance in Ohms is:

User Dotslash
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If the wire is stretched to double the length , the area of cross section gets reduced to half (as area = length x breadth). so above equation becomes, Thus,the new resistance is 4r

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User Djenny
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