Part A Suppose that you wish to fabricate a uniform wire out of 1.00 g of copper

Question

Part A

Suppose that you wish to fabricate a uniform wire out of 1.00 g of copper.If the wire is to have a resistance R = 0.500 ,and is all the copper is to be used, what will be (a) the lengthand (b) the diameter of the wire?
The resistivity of copper is 1.7 x 10^-8 .m

part B

Consider part A. If you were to use tungsten instead of copper what information about tungsten do you need to calculate the length of the wire?

Question 3 options:

density, resistivity and volume

density only

resistivity only

density and resistivity

density and volume

density, resistivity and volume

density only

resistivity only

density and resistivity

density and volume

Explanation / Answer

Part A)

a)

Resistance, R=pL/A where p is resistivity, A-area L- length

0.5=1.7*10-8 L/A

L/A= 2.94 * 107......... EQUATION 1

density of copper = 8,940,000 g/m3

Volume of 1g= 1/8,940,000 m3

LA=1/8,940,000 m3.......EQUATION 2

multiplying both equations

L2= 3.29

L=1.81m

b) A=1.81/(2.94 * 107)

=6.17 * 10-8 m2

Part B

Density and resistivity......they are materialistic quantity, as you can see we have used in case of copper...volume can be calculated from density

Related Questions

Navigate

• Browse (All)
• Browse P
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.