A galvanometer may be converted into an ammet | vedclass

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(D) To convert a galvanometer into an ammeter,a very small resistance (shunt) is connected in parallel,which makes the total resistance of the ammeter

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Voltmeter of range $10 \ V$

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(D) To convert a galvanometer into an ammeter,a very small resistance (shunt) is connected in parallel,which makes the total resistance of the ammeter very low.To convert a galvanometer into a voltmeter,a high resistance is connected in series,which makes the total resistance of the voltmeter very high.Comparing the options,ammeters have very low resistance compared to voltmeters.For a voltmeter,the resistance $R$ is given by $R = (V/I_g) - G$,where $V$ is the range,$I_g$ is the full-scale deflection current,and $G$ is the galvanometer resistance.As the range $V$ increases,the series resistance $R$ must increase to limit the current.Therefore,a voltmeter with a range of $10 \ V$ will have a higher resistance than a voltmeter with a range of $1 \ V$,and both will have significantly higher resistance than any ammeter.Thus,the voltmeter of range $10 \ V$ has the largest resistance.

$A$ galvanometer may be converted into an ammeter or a voltmeter. In which of the following cases will the resistance of the device so obtained be the largest?

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