(a) For what purpose Wheatstone bridge is used? (b) Write the balance equation of given Wheatstone bridge and simulate it to find the value of unknown resistance R4. Also use formula to calculate R4. R3 R1 1000 2400 \Key=A 5% Vin 1 -12V R2 2500 R4

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Wheatstone Bridge Method

A Wheatstone bridge is a circuit used to measure unknown resistance by measuring the ratios of the two branches of the circuit such that each branch has two resistance and out of four resistance one is unknown. The two branches are joined in between with the help of galvanometer which is used to determine the direction of the current. The main advantage of this circuit is that it can provide the most accurate measurement (different from a simple voltage separator).