Copper wire has resistance R. if the wire is made in a circular shape, find resistance between two diametrical opposite point in terms of original resistance.

Asked by Navaswati | 6th Oct, 2013, 07:38: AM

Expert Answer:

The copper wire is bent in a circle. When two diametrically opposite points are considered, we can imagine that, two resistances of value R/2 are connected in parallel.
 
Thus, the resistance between these two points is;
1/R' = 2/R + 2/R = 4/R
 
Thus, we have
R' = R/4

Answered by Romal Bhansali | 6th Oct, 2013, 09:52: AM

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