Posted by jason on Thursday, February 9, 2012 at 1:43pm.
A silver wire and a platinum wire of the same length have the same resistance. What is the ratio of the diameter of the silver wire to that of the platinum wire.

Physics  drwls, Thursday, February 9, 2012 at 1:57pm
p1^L1/D1^2 = p2*L2/D2^2 since resistances are equal.
(The p's are the resistivities, which you need to look up). Since L1 = L2,
D1/D2 = sqrt(p2/p1)
subscript "1" denotes silver and subscript "2" denotes platinum.
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