Questions
n resistances, each of r ohm, when connected in parallel give an equivalent resistance of R ohm. If these resistances were connected in series, the combination would have a resistance in ohms, equal to
detailed solution
Correct option is A
Equivalent resistance of n resistances each of r ohm in parallel is given by1R =1r +1r+....+n times = nrso, r = nRWhen these resistances are connected in series, effective resistance isR'=r+r+.....+ n times = nr∴ R'=nnR=n2RTalk to our academic expert!
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A uniform wire of resistance 36 ohm is bent in the form of a circle as shown in fig The effective resistance across the points A and B is
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