P27_020.PDF

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Chapter 27 - 27.20
20. The thickness (diameter) of the wire is denoted by D .Weuse R
∝
L/A (Eq. 27-16) and note that
A = 4 πD 2
∝
D 2 . The resistance of the second wire is given by
R 2 = R A 1
A 2
L 2
L 1
= R D 1
D 2
2 L 2
L 1
= R (2) 2 1
2
=2 R.

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