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Q.

The actual value of resistance ‘R’ shown in the figure is 50Ω . This is measured in an experiment as shown using the standard formula R = VI where V and I are the readings of Voltmeter and Ammeter respectively . If the measured value of R is 5% less, then the internal resistance of the voltmeter is,

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Detailed Solution

The actual value is R=50Ω but measured value is 0.95R  (∵5% less than original i.e., R-5%R=R-5R100=0.95R)  R and RV ∵RV= resistance of voltmeter are in parallel. Req =  RRVR+RV ⇒0.95R =  RRVR+RV ⇒Rv= 19 R ⇒Rv= 19 ×50 = 950 Ω
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The actual value of resistance ‘R’ shown in the figure is 50Ω . This is measured in an experiment as shown using the standard formula R = VI where V and I are the readings of Voltmeter and Ammeter respectively . If the measured value of R is 5% less, then the internal resistance of the voltmeter is,