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Answer:
Option A - R/2 is the correct answer.
Explanation:
Since, the above circuit follow wheet stone bridge for the upper part. So, R in the middle can be neglected.
So, We have the resistances connected in parallel, with above two as 2R each and R the remaining one.
So, 1/Re = 1/2R + 1/2R + 1/R
1/Req = 4/2R
Req = R/2
So, the answer is R/2 ohms
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