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In Fig. 11.12 type problems, R1=10, R2=40 ohm are in parallel; R3=30, R4=20, R5=60 ohm are in parallel, and both groups are in series. The equivalent resistance of R1 and R2 alone is:

Question
In Fig. 11.12 type problems, R1=10, R2=40 ohm are in parallel; R3=30, R4=20, R5=60 ohm are in parallel, and both groups are in series. The equivalent resistance of R1 and R2 alone is:
50 ohm
8 ohm
25 ohm
4 ohm
Answer
8 ohm
Detailed Explanation
1/R' = 1/10+1/40 = 4/40+1/40 = 5/40, so R' = 8 ohm.
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