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What is the magnitude of the potential different across the 5ohm resistor?

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The other resistors are equivalent to a 20Ω in parallel with a 30Ω, giving a
1/R = 1/20 + 1/30
R = 12Ω
So now you have a 5Ω and a 12Ω in series
5/17 * 11V = 3.24V

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