A wire of uniform thickness with a resistance of 27 ohm is cut into three equal pieces and they are joined in parallel. Find the equivalent resistance of the parallel combination.
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let the length of one wire is x
then 3x=27
x=9
since three are parallel
1÷R=3÷9=1/3
R=3
Answer:
In such a case
Reff=R/n^2
Reff=27/9=3
Note-this formula is used in only parallel