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The power through a cylindrical resistor is 2.4 W. If the radius of this resistor is...

The power through a cylindrical resistor is 2.4 W. If the radius of this resistor is 3.8 mm, calculate the length of the resistor. The resistivity of this resistor is 6.2 x10-5 Ω.m, and the magnitude of the current density is 2.6 x105 A/m2.

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