All the parts of the question........
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Answer:
(a)- 5R
(b)- 1/2 ohm
(c)- 1/2 ohm
(d)- 2 ohm
Explanation:
(a) in the diagram all the four resistance are in series so they are added
(b) first two resistance are in PARALLEL with each other and the second two resistance are also in parallel with each other and also with the first pair so the can be added by parallel addition formula i.e, 1/R= 1/R' +1/R"
(c) in third case middle two resistance are in series and the first second and third resistance are in parallel
(d) in this ques also there is a combination of series and parallel resistances
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