A Galvanometer is an instrument that can be used to construct an ammeter for measuring…
Physics · JEE Advanced · NTA Exams — Current Electricity
A Galvanometer is an instrument that can be used to construct an ammeter for measuring current .It can be used converted to a voltmeter. It can also be used as a multimeter. In all cases resistance must be connected to galvanometer either in series or in parallel to effect the change .To turn into an ammeter a low resistance in parallel of suitable value and to convert to a voltmeter a resistance in series is connected to the galvanometer. You are given a galvanometer for which a current of 10 mA is required for full deflection .The internal resistance of the galvanometer is 100 ohm. Then answer the following questions.
In voltmeter circuit the current in resistor R must be
- negligible so that it only has small effect on voltage reading
- substantial but does not have any effect on voltage reading
- substantial, but does have some effect on voltage reading
- none of these
Answer
(A) negligible so that it only has small effect on voltage reading
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