Two identical moving coil galvanometers have 10 Ω resistance and full scale deflection at…

Physics · JEE Advanced · NTA Exams — Current Electricity

Two identical moving coil galvanometers have 10 Ω resistance and full scale deflection at 2 μA current. One of them is converted into a voltmeter of 100 mV full scale reading and the other into an ammeter of
1 mA full scale current using appropriate resistors. These are then used to measure the voltage and current in the Ohm’s law experiment with R = 1000 Ω resistor by using an ideal cell. Which of the following statement(s) is/are correct?
  1. The resistance of the Voltmeter will be 100 kW
  2. The resistance of the Ammeter will be 0.02 W (round off to 2nd decimal place)
  3. If ideal cell is replaced by a cell having internal resistance of 5 W then the measured value of R will be more than 1000 W
  4. The measured value of R will be 978 W < R < 982 W

Answer

(D) The measured value of R will be 978 W R W

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