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Question

What is the equivalent resistance between A and B in the given circuit?
678138_4788084b11f641b7ac44bae92634973b.png

A
4Ω
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B
2Ω
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C
83Ω
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D
38Ω
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Solution

The correct option is B 83Ω
R1 and R2 are in series.
R12=R1+R2=4Ω
R12 and R3 are in parallel
R123=R3×R12R3+R12
=4×44+4=2Ω
R123 and R4 are in series
R1234 and R5 are in parallel
R12345=2Ω
R12345 and R6 are in series
2Ω+2Ω=4Ω=R123456
Now, R123456 and R7 are in parallel
Rcomb=4×84+8=3212=83Ω.

712360_678138_ans_ec490641e71f4c4cb3cd5d75919876f5.png

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