d) Figure Q2(d) shows an unbalanced Wheatstone bridge. Calculate the following; i) Output voltage across points C and D. (5 marks) ii) Value of R4 required to balance the bridge circuit. (4 marks) R: 802 R3 4802 100V i Voat R4 1602 1202 Figure Q2(d)

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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).