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A moving coil galvanometer of 50 ohms resistance gives full deflection when a current of 0.5 milli amp passes through it. To convert it into a voltmeter of 10V range, the resistance to be connected in series with the galvanometer is,

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20,050Ω

20Ω

None of the above

19,950Ω

answer is C.

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Detailed Solution

V = $i_{g}$ (G+R) ; 10=0.5 x 10^-3(50+ R)
$\Rightarrow$ R=19,950

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