JEE Main & Advanced JEE Main Paper (Held On 12 May 2012)

  • question_answer
    It is preferable to measure the e.m.f. of a cell by potentiometer than by a voltmeter because of the following possible reasons. (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?   JEE Main Online Paper (Held On 12 May 2012)

    A) (i),(iii),(iv)           

    B)                        (i), (iii), (iv)

    C)                        (i),(ii)                                    

    D)                        (i),(ii),(iii),(iv)

    Correct Answer: C

    Solution :

                    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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