Questions

A microammeter has a resistance of 100 $Ω$ and a full scale range of 50 $μ$ A. It can be used as a voltmeter or as a higher range ammeter provided a resistance is added to it. Pick the correct range and resistance combination(s).

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50 V range with 10 KΩ resistance in series

10 V range with 200 kΩ resistance in series

5 mA range with 1Ω resistance in parallel

10 mA range with 1Ωresistance in parallel

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detailed solution

Correct option is B

We know that I˙g=V/(R+G)For a,50×10−6=50/(R+100)R=106−100ΩFor b,50×10−6=10/(R+100)∴ R=200×103ΩFurther ig={S/(S+G)}iFor c,50×10−6={S/(S+100)}5×10−3Solving, we get S=100/99≈1Ω

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