Physics, 30.10.2019 02:31, jjace0016

Auniform rectangular segment of copper wire with length and cross-sectional area has resistance: r. then this resistor is melted down, and 1/5 the material is used to make a new uniform rectangular resistor with resistance r. what is the length of thisnew resistor?

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Auniform rectangular segment of copper wire with length and cross-sectional area has resistance: r....