FULL SCREEN PRINTER VERSION BACK NEXT ES Chapter 20, Problem 018 GO 2 Your answe

Question

FULL SCREEN PRINTER VERSION BACK NEXT ES Chapter 20, Problem 018 GO 2 Your answer is partially correct. Try again A tungsten wire has a radius of 0.066 mm and is heated from 20.0 to 1418 °C. The temperature coefficient of resistivity is a Neglect any effects due to thermal expansion of the wire. 32 38 34.5 x 103 (coy1. When 130 V is applied across the ends of the hot wire, a current of 2.3 A is produced. How long is the wire? 48 51 53 Number Units m the tolerance is +/-2% SHOW HINT GO TUTORIAL LINK TO TEXT

Explanation / Answer

R'= R [ 1+ (alpha)(change in temperature) ]

130/2.3= R [ 1+ 4.5*10^-3*1398)

R= 7.752 ohm

Also, R= rho* L/ A

7.752= 5.65*10^-8 * L/(3.14* (0.066*10^-3)^2)

L= 1.88 m

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Comment in case any doubt.. good luck

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