3.а)i)A potential difference of 1.5 V is applied across a tungsten wire of length2.4 m and cross- sectional area 0.550 mm?. What is the magnitude ofcurrent in the wire? (Resistivity of tungsten, p =5.6 x 108 2 m)ii)The resistance of a filament of a bulb is 200 when the bulb is lit upand 12 2 when it is not lit. Calculate the temperature of the filamentwhen alight. The room temperature is 30° C and the temperaturecoefficient of the filament is 4.5 x 103 °C'.

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A potential difference of 1.5 V is applied across a tungsten wire of length 2.4 m and cross- sectional area 0.550 mm². What is the magnitude of current in the wire? (Resistivity of tungsten, p =5.6 x 108 2 m)

A potential difference of 1.5 V is applied across a tungsten wire of length 2.4 m and cross- sectional area 0.550 mm². What is the magnitude of current in the wire? (Resistivity of tungsten, p =5.6 x 108 2 m)

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Concept explainers

Resistivity

Resistivity is a characteristic property of the conductor’s material that measures the extent to which the material opposes the flow of current. It is denoted by the Greek letter “rho”. Electrical resistivity, also known as specific resistance, depends on the nature of the material of the conductor and is unaffected by its dimensions.

Question

3.
а)
i)
A potential difference of 1.5 V is applied across a tungsten wire of length
2.4 m and cross- sectional area 0.550 mm?. What is the magnitude of
current in the wire? (Resistivity of tungsten, p =5.6 x 108 2 m)
ii)
The resistance of a filament of a bulb is 200 when the bulb is lit up
and 12 2 when it is not lit. Calculate the temperature of the filament
when alight. The room temperature is 30° C and the temperature
coefficient of the filament is 4.5 x 103 °C'.

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