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(a) what is meant by series and parallel...

(a) what is meant by series and parallel combination of resistances ?
(b) in which case, series combination or parallel combination, the combined resistance is less than any of the individual resistances ?
(c ) How should two resistance of `2 Omega` each be connected so as to produce an equivalent resistance of `1 Omega` ?
In the circuit diagram given here , find:
(i) total resistance of the circuit
(ii) total current flowing in the circuit, and
(iii) the potential difference across `R_(1)`

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