| It is preferable to measure the e.m.f. of a cell by potentiometer than by a voltmeter because of the following possible reasons. [JEE ONLINE 12-05-2012] |
| (i) In case of potentiometer, no current flows through the cell. |
| (ii) The length of the potentiometer allows greater precision. |
| (iii) Measurement by the potentiometer is quicker. |
| (iv) The sensitivity of the galvanometer, when using a potentiometer is not relevant. |
| Which of these reasons are correct? |
A) (i), (iii), (iv)
B) (i), (iii), (iv)
C) (i),(ii)
D) (i), (ii), (iii), (iv)
Correct Answer: C
Solution :
| [c] To measure the emf of a cell we prefer potentiometer rather than voltmeter because |
| (i) the length of potentiometer which allows greater precision. |
| (ii) in case of potentiometer, no current flows through the cell. |
| (iii) of high sensitivity. |
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