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Calculate the equivalent resistance between P and Q in the following diagram:

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Calculate the equivalent resistance between P and Q in the following diagram:

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 r1 , r2 are in series 

Rs = 10 + 10 = 20Ω 

Rs and r3 are in parallel 

1/Rp between A and B = 1/20+ 1/5 = 5/20= 1/4

∴ Rp = 4 

Now r4, Rp and r5 are in series 

∴ R = 3 + 4 + 3 = 10Ω

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