Please answer the 12th question.........
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This is a case of balanced WHEATSTONE BRIDGE.
As a result of this balanced WHEATSTONE BRIDGE, the middle 9 ohm resistance will not be considered.
Just remove the 9 ohm and the circuit will be simplified.
Therefore equivalent resistance is
(3*6)/(3+6) = 2 ohm. [ Parallel combinations].
b)when connected in series, R1 will be equal to nR.
when in parallel R2 will be R/n
therefore R1/R2 = n^2.
Hope you will be able to understand.
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