A 670m long eureka wire has resistance of 250 ohms. What length of the same wire will have a resistance of 110 ohms?
Answer
Resistance is given by
"R=\\frac{\\rho l}{A}"
So in above case length of wire is given
"l'=\\frac{R'l}{R}\\\\=\\frac{110*670}{250}\\\\=294.8m"
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