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प्रश्न
State the underlying principle of a potentiometer ?
उत्तर
Principle of potentiometer: When a steady current flows through it, the potential difference across a uniform wire is directly proportional to the length of the part across which the potential is measured.
संबंधित प्रश्न
(i) State the principle on which a potentiometer works. How can a given potentiometer be made more sensitive?
State the working principle of a potentiometer. With the help of the circuit diagram, explain how a potentiometer is used to compare the emf's of two primary cells. Obtain the required expression used for comparing the emfs.
Two students ‘X’ and ‘Y’ perform an experiment on potentiometer separately using the circuit given below:
Keeping other parameters unchanged, how will the position of the null point be affected if
(i) ‘X’ increases the value of resistance R in the set-up by keeping the key K1 closed and the Key K2 opens?
(ii) ‘Y’ decreases the value of resistance S in the set-up, while the key K2 remains open and they K1 closed?
Justify.
The net resistance of a voltmeter should be large to ensure that ______________ .
When the balance point is obtained in the potentiometer, a current is drawn from ______.
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.
What is the SI unit of potential gradient?
The potentiometer is more sensitive, when ______.
Two cells when connected in series are balanced on 8 m on a potentiometer. If the cells are connected with polarities of one of the cell reversed, they balance on 2 m. The ratio of e.m.f's of the two cells is ____________.
When two cells of e.m.f 1.5 V and 1.1 V connected in series are balanced on a potentiometer, the balancing length is 260 cm. The balancing length, when they are connected in opposition is (in cm) ____________.
