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Figure shows a potentiometer circuit for comparison of two resistances. The balance point with a standard resistor R= 10.0 Omegais found to be 72.6 cm, while that with the unknown resistance X is 68.5 cm. Determine the value of X. What might you do if you failed to find a balance point with the given cell of emf epsi ? (Take internal resistance r=1Omega) |
| Answer» Solution :X=6.0`Omega`. If there is no balance POINT, it means potential drop across R or X is greater than the potential drop across the potentiometer WIRE AB. The obvious thing to do is to reduce CURRENT in the outside CIRCUIT and hence potential drops across R and X) suitably by putting a series resistor. | |