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प्रश्न
State the principle of working of a potentiometer.
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उत्तर
Principle of potentiometer: When a constant current is passed through a wire of uniform cross-sectional area, the potential drop across any portion of the wire is directly proportional to the length of that portion.
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संबंधित प्रश्न
Define potential gradient of the potentiometer wire.
Describe how a potentiometer is used to compare the EMFs of two cells by connecting the cells individually.
A potential drop per unit length along a wire is 5 × 10−3 V/m. If the emf of a cell balances against length 216 cm of this potentiometer wire, find the emf of the cell.
Describe how a potentiometer is used to compare the emf's of two cells by the combination method.
Which of the following is true for a potentiometer?
A student connected the circuit as shown in the figure to determine the internal resistance of a cell E1 by potentiometer (E > E1). He is unable to obtain the null point because ______.
In a potentiometer experiment when three cells A, B, C are connected in series the balancing length is found to be 740 cm. If A and B are connected in series, the balancing length is 440 cm and when B and C are connected in series, it is 540 cm. The e.m.f. of A, B, and C cells EA, EB, EC are respectively (in volt) ______
A potentiometer wire is 4 m long and a potential difference of 3 V is maintained between the ends. The e.m.f. of the cell which balances against a length of 100 cm of the potentiometer wire is ______
A potentiometer is an accurate and versatile device to make electrical measurements of E.M.F. because the method involves ______.
Draw neat labelled diagram of potentiometer as voltage divider.
