Answer :
(a) In order to obtain a total resistance of 4 from three resistors of 2
, 3
and 6
.
Firstly, connect the two resistors of 3 and 6
in parallel to get a total resistance of 2
which is less than the lowest individual resistance.
R = R1+ R2
R = 2 + 2
R = 4
The arrangement of three resistors of 2,3 and 6
which gives a total resistance of 4
can now be represented as follows :
Thus, we can obtain a total resistance of 4by connecting parallel combination of 3
and 6
resistors in series with 2
resistor.
(b) In order to obtain a total resistance of 1 from three resistors of 2
, 3
and 6Q, all the three resistors should be connected in parallel. This is because in parallel combination:
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