A microammeter has a resistance of 10Ω 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. The correct range and resista

Question

A microammeter has a resistance of 10Ω 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. The correct range and resistances combination (approximately) :-

TestHub · Accepted Answer

As a voltmeter, the series resistance needed is $R_{s} = \frac{V}{I _{g}} - R_{g}$ .

For a 10 V range: $R_{s} = \frac{10}{50 \times 1 0 ^{- 6}} - 10 = 200 k Ω - 10 \approx 200 k Ω$ - option (B).

A 50 V range would need $\approx 1 M Ω$ in series, and the 5 mA / 10 mA ammeter ranges need shunts of $\approx 0.1 Ω$ and $0.05 Ω$ , not $1 Ω$ .

Physics - Current Electricity Question with Solution | TestHub

Options:

Doubts & Discussion

JEE Main 2027 (Class 12+)