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प्रश्न
Calculate the equivalent resistance between P and Q from the following diagram:
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उत्तर
`1/"R"_1 = 1/20 + 1/5`
`1/"R"_1 = (1 + 4)/20 = 5/20`
R1 = 4 Ω
Now, 3 Ω, 4 Ω and 2 Ω in series.
So, R = 3 + 4 + 2 = 9 Ω
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