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  3. JEE Main & Advanced

JEE Main & Advanced Sample Paper JEE Main Sample Paper-16

  • question_answer
    A voltmeter with resistance \[500\,\Omega \] is used to measure the emf of a cell of internal resistance \[4\,\Omega \]. The percentage error in the reading of the voltmeter will be

    A)  0.2%                                    

    B)  0.8%

    C)  1.4%                                    

    D)  2.2%

    Correct Answer: B

    Solution :

    \[i=\frac{\varepsilon }{504}\] \[v=\varepsilon -4i=\varepsilon -\frac{\varepsilon }{504}\times 4\] \[v=\varepsilon \left( 1-\frac{1}{126} \right)=\varepsilon \frac{125}{126}\] \[\Rightarrow \]               \[\Delta v=\frac{\varepsilon }{126}\]


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