In a potentiometer experiment for measuring the emf of cell, the null point is at 480 cm when we have a `400Omega` resistor in series with the cell an

Question

In a potentiometer experiment for measuring the emf of cell, the null point is at 480 cm when we have a `400Omega` resistor in series with the cell an

In a potentiometer experiment for measuring the emf of cell, the null point is at 480 cm when we have a `400Omega` resistor in series with the cell and galvanometer . If the series resistances is reduced to half, the null point will be at
A. 120 cm
B. 240 cm
C. 480 cm
D. 600 cm

Monjur Alahi

5 views

2025-01-04 04:42

1 Answers

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Salim Ahmed Kawsar · Accepted Answer · 2023-02-05T15:29:48+06:00

Salim Ahmed Kawsar

Correct Answer - C
At null point, no current flows through galvanometer. Therefore, the resistance connected in series with galvnometer, at null point position will be ineffective. Thus, null point is obtained on potentiometer wire at the original position after the removal of series resistance galvanometer.

5 views Answered 2023-02-05 15:29