I AM FACING DIFFICULTY IN THIS NUMERICAL QUESTION : "WHAT WILL BE THE LENGHT OF THE METAL WIRE IF ITS AREA OF CROSS-SECTION IS 1.5 * 10 to the power -6 metre square, resistivity is 2 * 10 to the power -8 ohm metre and resistance is 30 ohm " ?????????????

Asked by  | 10th May, 2012, 02:37: PM

Expert Answer:

l=?
A=1.5x10-6 m2
?=2x10-8?m
R=30ohm
as we know:R=?l/A
so solving tghis: we get: l=22.5x102 m

Answered by  | 10th May, 2012, 04:58: PM

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