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Describe the use of a potentiometer to c...

Describe the use of a potentiometer to compare the emf's of two cells by the direct method (i.e., connecting them separately).

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### Step-by-Step Solution: 1. **Understanding the Potentiometer Setup**: - A potentiometer is an instrument used to measure the electromotive force (emf) of cells. It consists of a long wire of uniform cross-section and resistance, connected in series with a known voltage source. 2. **Circuit Diagram**: - Draw the circuit diagram showing the potentiometer wire, two cells (E1 and E2), a galvanometer, and a switch (K1 and K2) to connect the cells separately. ...
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