Figure P2–63 shows a voltage bridge circuit, that is, two voltage dividers in parallel with a source vS. One resistor RX is variable. The goal is often to ‘‘balance’’ the bridge by making vX ¼ 0V. Derive an expression for RX in terms of the other resistors for when the bridge is balanced.AppendixLO1

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VS 1+ RA +Vx m RB FIGURE P2-63 W RC Rx