There are 8 equal resistors each of resistance R. Two are connected in parallel, such four groups are connected in series, the total resistance will be:
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Answer: 2r
Explanation:
Ra = r^2/2r
Rb = r^2/2r
Rc = r^2/2r
Rd = r^2/2r
now
Req = Ra + Rb + Rc + Rd
Req = 4r^2/2r
Req = 2r
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