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How to measure an unknown voltage using ...

How to measure an unknown voltage using potentiometer.

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The unknown voltage V is conneted across the potentiometer wire as shown in figure. The positive terminal of the unknown voltage is kept on the same side as to the source of the top most battery. When reading of galvanometer is zero then we sy that the meter is balanced. In that condition V=xl.
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RESONANCE-CURRENT ELECTRICITY-High Level Problems (HIP)
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