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A galvanometer of 25 ohm resistance can read a maximum current of 6mA. It can be used as a voltmeter to measure maximum potential difference of 6V by connecting a resistance to galvanometer. Identify the correct choice from the following

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975 Ω in series

975 Ω in parallel

1025 Ω in series

1025 Ω in parallel

answer is C.

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Detailed Solution

$\begin{array}{l} G = 25 Ω; i_{g} = 6 \times 10^{- 3} A; V = 6 volt \\ V = i_{g} (G + R) \\ 6 = 6 \times 10^{3} [25 + R] ∴ R = 975 Ω inseries \end{array}$

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