A voltmeter of resistance \( 2000 \Omega \) can measure a maximum p...

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A voltmeter of resistance \( 2000 \Omega \) can measure a maximum potential difference of \( 2 \mathrm{~V} \). If it is to be converted into a voltmeter of range \( 20 \mathrm{~V} \), the required resistance in series will be
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