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A 100 V voltmeter of internal resistance $20 k Ω$ in series with a high resistance R is connected to a 110 V line. If the voltmeter reads 5 V the value of R is

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detailed solution

Correct option is C

Here i = 11020 × 103+R∵ V=iR ⇒ 5= 11020 × 103 +R × 20 × 103⇒ 105 +5R=22 × 105 ⇒ R=21 × 1055 =420 kΩ

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A 100 V voltmeter of internal resistance 20 kΩ in series with a high resistance R is connected to a 110 V line. If the voltmeter reads 5 V the value of R is

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Ready to Test Your Skills?

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A 100 V voltmeter of internal resistance $20 k Ω$ in series with a high resistance R is connected to a 110 V line. If the voltmeter reads 5 V the value of R is