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A Galvanometer is an instrument that can be used to construct an ammeter for measuring current. It can be used to convert 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 is connected in series. 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(1)  Negligible so that it only has small effect on voltage reading(2) Substantial but does not have any effect on voltage reading(3) Substantial, but does have some effect on voltage reading (4) None of these

Answer»

Correct option (1) Negligible so that it only has small effect on voltage reading

Explanation:

As resistance of voltmeter is very high.



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