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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?

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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