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A 150 V voltmeter has a resistance of 20...

A 150 V voltmeter has a resistance of 20,000`Omega` when connected in series with a large resistance R across a 110-volt line the meter reads 5V. Find the resistance R.

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The correct Answer is:
`290 kOmega`, Due to very small value of current, Ammeter has not been used. The ammeter reading would been very small. Note that this is unusual use of a voltmeter. It is meant only for the measurement of high resistance.
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