Potentiometer wire AB has length = 100 cm. Total resistance of wire is 10 $Ω$ , when the jockey is connected at D (AD = 10x cm), ammeter reading is 0.5 amp. Value of x is. (Resistance of ammeter is $1 Ω$ and the cell has no internal resistance).

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Solution

Apply Kirchhoff's law
Ad=3cm.

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