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NEET Sample Paper NEET Sample Test Paper-55

  • question_answer
    A galvanometer of resistance\[50\,\Omega \]. is connected to a battery of 3V along with a resistance of \[2950\,\,\Omega \] in series. A full scale deflection of 30 divisions is obtained in the galvanometer. In order to reduce this deflection to 20 divisions the resistance in series should be-

    A) \[4450\,\Omega \]                      

    B) \[5050\text{ }\Omega \]

    C) \[5550\text{ }\Omega \]             

    D) \[6050\text{ }\Omega \]

    Correct Answer: A

    Solution :

    \[{{I}_{g}}=\frac{3}{50+2950}\,\,=\,\frac{3}{3000}\] \[{{I}_{g}}\,\,=\,\,1\text{ }mA\] \[\because \,\,\,30\,\,\_\_\_\_\_\_\_\_\_\_\,\,=\,\,1\,\,mA\] \[\therefore \,\,\,1\,\,\_\_\_\_\_\_\_\_\_\_\,\,=\,\,\,\frac{1}{30}\] \[\therefore \,\,\,20\,\,\_\_\_\_\_\_\_\_\_\_\,\,=\,\,\,\frac{1}{30}\times 20\] \[\frac{2}{3}\,\,=\,\,\frac{3}{50+R}\]


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