Instead of voltmeter, potentiometer is a...

Instead of voltmeter, potentiometer is always used to measure e.m.f. of cell, because at the null point, the potentiometer

does not draw current from balanced cell

draw current from driven cell

ends its current through driven cell

none of these

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Potentiometer is superior to voltmeter because

Rohan, a Science student purchased a few cells from a shop keeper for his torch. He noticed that the torch was not working will with these new cells. He thought of checking the emf of each cell. Using a potentiometer he measured their emfs and noticed that the emf of each cell was less than the value of oblige him. He then lodged a complaint with consumer forum and got theredressal. Read the above passage and answer the following question: (i) What are the basic values displayed by Rohan? (ii) Why rohan used potentiometer instead of voltmeter to measure emf of the cells? (iii) If the lenght of potentiometer wire is (a) doubled and (b) halved, what will be the effect on the position of zero deflection in a potentiometer.

A potentiometer is an ideal device of measuring potential difference because

Assertion: Potentiometer measures correct value of emf of a cell. Reason: No current flows through cell at null point of potentiometer.

Why do we prefer a potentiometer to measure emf of a cell rather than a voltmeter ?

In a potentiometer experiment of measuring the e.m.f. of a cell, the null point is at 300 cm, when we have a resistance of 200 Omega in series with the cell and the galvanometer. If the resistance is increased to 300 Omega , the null point will be shifted through

NIKITA PUBLICATION-CURRENT ELECTRICITY-Multiple Choice Questions

In the construction of potentiometer, the length of wire used is
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A potentiometer is more sensitive when
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Instead of voltmeter, potentiometer is always used to measure e.m.f. ...
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The potentiometer wire of resistance R is connected in series with a c...
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Potentiometer is used to
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The internal resistance of a cell by potentiometer is given by
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In potentiometer experiment to determine internal resistance of the ce...
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The current, in a potentiometer wire of 100 cm length, is adjusted to ...
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In given figure, the potentiometer wire AB has a resistance of 5 Omeg...
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The wire of potentiometer has resistance 4 Omega and length 1m. It i...
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A potentiometer has a uniform wire of length 10m and resistance 5 Ome...
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A voltmeter has a resistance of 50 Omega is connected across a cell ...
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With a potentiometer null point were obtained at 140 cm and 180 cm w...
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In a potentiometer experiment it is found that no current passes throu...
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The potential gradient along the length of a uniform wire is 5 V/m. Th...
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In figure AB is a potentiometer wire of length 10 m and resistance 1...
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In figure, AB is a potentiometer wire, length 10 m and resistance 2 Om...
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A plantinum wire has resistance of 10 Omega at 0^(@)C and 20 Omega at ...
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In the adjacent circuit the ammeter reads 5.0 A and voltmeter reads 20...
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Following are the readings of potential and current through a specimen...
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