Question
Sun July 10, 2011 By:

a wire of resistance 5 ohm is bent in the form of a closed circle what is the effective resistance b/w 2 points at the ends of any diameter in the circle

Expert Reply
Mon July 11, 2011

The length of the wire between two points at the ends of a diameter of a circle is

half of the whole wire. The resistance of a conductor is directly proportional to its

length.

Thus, the two resistance 5/2  ohm will be in parallel.
Let R be the effective resistance.

1/R=2/5+2/5

1/R=4/5

R=5/4=1.25 ohm.
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