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I have attached my question. (11.5)

I have attached my question. (11.5)

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Physics- 8203681.doc

Let current in R1 and Rvar be i1 and in the other branch be i2
i1R1 = i2R2 i1R1 = 129i2
i1Rvar = i2R3 52i1 = 86i2
Dividing these two equations, we get;
R1/52 = 129/86 R1 = 78Ω

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