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A particular wire has a resistivity of 2.1*10^-8 Ω · m and a cross-sectional area of...

A particular wire has a resistivity of 2.1*10^-8 Ω · m and a cross-sectional area of 2.9*10^-6 m2. A length of this wire is to be used as a resistor that will receive 41 W of power when connected across a 20-V battery. What length of wire is required? _________km

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Answer #1

P272.1 x 10-8 nim Pulw A => 269x10-6 m2 V=> 20 v Power (P) = x2 R= M = 12032.39.25n R = Se PL = L = RA 17 69.75) (2-9x1000) 2

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