(b) You have four resistors of 
each.
Show how would you connect these resistors to have
effective resistance of ?
Answer:
(a)
and 
are
in parallel, so
(1)
Now 
and
are in series, so
Again 
and 
are in parallel, so
So, current flowing through the circuit is
(1)
(b) Two 
resistors are
connected in parallel. Two such parallel combination must be connected in series
to get effective resistance of .
Such combination is shown below
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