AP EAMCET Engineering 26 Apr 2017 Shift 1 Paper

In the determination of die internal resistance of a cell with a potentiometer, the error m the measurement of the balancing length is ± 1 mm. When the cell alone is connected in the circuit, the balancing length is obtained at 60 cm and when the cell is shunted with a resistance of 10Ω ±2%. the balancing length is obtained at 50 cm. The error in the determination of the internal resistance of the cell is______