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A galvanometer has a resistance of $100 Ω$ and a full scale range $50 Ω A$ . 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 k Ω

resistance in series

5 m A

range with

1 Ω

resistance in parallel

10 m A

range with

1 Ω

resistance in parallel

10 V

range with

200 k Ω

resistance in series

answer is B, C.

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Detailed Solution

V = i_{g} (G + R) = (50 \times 10^{- 6}) (100 + 2 \times 10^{5}) \approx 10 V

$∴ \frac{i - i_{g}}{i_{g}} = \frac{G}{S}$

$= (50 \times 10^{- 6}) + (\frac{100}{1}) (50 \times 10^{- 6})$

$= (0.05 \times 10^{- 3}) + 5 \times 10^{- 3} \approx 5 m A$

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A galvanometer has a resistance of 100 Ω and a full scale range 50Ω 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) .

Detailed Solution

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A galvanometer has a resistance of $100 Ω$ and a full scale range $50 Ω A$ . 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 $(s)$ .