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Resistance in a Wheatstone bridge

A simple Wheatstone bridge has arms of R1 = 120 ohm, R2 =100 ohm and R3 =125 ohm. What is the value of R4 for balance? If R4 = 200 ohm and the bridge is driven with a source of 200 V. What is the open circuit voltage?

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Wheatstone bridge is a measuring instrument invented by Samuel Hunter Christie in 1833 and improved and popularized by Sir Charles Wheatstone in 1843. It is used to measure an unknown electrical ...

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The solution provides a detailed and step-by-step explanation (including theory and circuit drawing) for the problem.