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  4. You are given an ammeter, a galvanometer and a voltmeter. From these, the device having maximum resistance is

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Q. You are given an ammeter, a galvanometer and a voltmeter. From these, the device having maximum resistance is

UPSEEUPSEE 2019

Solution:

Electric circuit diagram of ammeter, galvanometer and voltmeter is shown below,
$(i)$ Ammeter
image
$\Rightarrow R_{eq \left(A\right) } = \frac{R_{s}R_{G}}{R_{G} +R_{s} }$
$(ii)$ Galvanometer
image
$\Rightarrow R_{eq \left(G\right) } =R_{G} $
$(iii)$ Voltmeter
image
$\Rightarrow R_{eq \left(v\right) } =R_{G} +R_{V} $
Hence, the order of resistances
$ R_{eq \left(v\right) } > R_{req\left(G\right)} > R_{eq\left(A\right)} $
So, the maximum resistance device is voltmeter.