Thu May 10, 2012 By:

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 " ?????????????

Expert Reply
Thu May 10, 2012
A=1.5x10-6 m2
as we know:R=?l/A
so solving tghis: we get: l=22.5x102 m
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