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KVPY Sample Paper KVPY Stream-SX Model Paper-29

  • question_answer
    Two scales on voltmeter measure voltages up to 20V and 30V. The resistance connected in series with galvanometer is \[1680\Omega \] for the 20V scale and \[2930\Omega \] for the 30V scale in the same galvanometer. The resistance of the galvanometer and the full scale current are:

    A) \[320\Omega \] and 10 mA

    B) \[70\Omega \] and 10 mA

    C) \[820\Omega \] and 10 mA

    D) \[820\Omega \] and 8 mA

    Correct Answer: D

    Solution :

    \[\frac{20}{Ig}-1680={{R}_{G}};\]
    \[\frac{30}{Ig}-2930={{R}_{G}}\]
    \[\therefore {{I}_{g}}=8mA\] and \[{{R}_{G}}=820\Omega \]


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