A wire of resistance math xmlns=http://www.w3.org/1998/Math/MathMLm...

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A wire of resistance math xmlns=http://www.w3.org/1998/Math/MathMLmi mathvariant=normalR/mi/math is stretched so that its length becomes math xmlns=http://www.w3.org/1998/Math/MathMLmn3/mn/math times the original length. The new resistance is:
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