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In a Wheatstone bridge ABCD, a galvanometer is connected between A and C, and a battery among B and D.
A resistor of unknown value is connected among A and B.
When the bridge is balanced, the resistance among B and C is 100Ω, that between C and D is 10Ω and that between D and A is 400Ω.
Calculate the value of the unknown resistance.
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