The electric field and magnetic field the surface of the resistor, the Poynting vector and the flux of Poynting vector.

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Chapter 29, Problem 60P

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The electric field and magnetic field the surface of the resistor, the Poynting vector and the flux of Poynting vector.

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When an electric current flows through the filament of an incandescent light bulb, it gets very hot and glows (or incandesces). Consider a particular bulb with a filament with 140 Ω resistance which carries a current of 1.00 A. Assume the length of the filament is L = 9.00 cm long with a radius of r = 0.900 mm. (a) Calculate the Poynting vector (in kW/m2) at the surface of the filament, associated with the static electric field producing the current and the current's static magnetic field. magnitude: ? kW/m2 direction: Radially inward or outward? (b) Find the magnitudes of the static electric field (in kV/m) and static magnetic field (in µT) at the surface of the filament. electric field: ? kV/m magnetic field: ? µT

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