A microammeter has a resistance of $100 Ω$ and 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
a) 50V range with $10 k Ω$ resistance in series
b) 10V range with $200 k Ω$ resistance in series
c) 5mA range with $1 Ω$ resistance in parallel
d) 10mA range with $0.1 Ω$ resistance in parallel

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a,c

b,c

a,d

b,d

answer is B.

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Detailed Solution

$S = \frac{G}{\frac{i}{i g} - 1}; R = (\frac{V}{V g} - 1) \times G$

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