Physics - Current Electricity Question with Solution | TestHub

PhysicsCurrent ElectricityElectrical instrumentHard2 minPYQ_2016

PhysicsHardsingle choice

A voltmeter of resistance $20000Ω$ reads 5 volt. To make it read 20 volt, the extra resistance required is

Options:

Answer:

Solution:

For a voltmeter, in which current $I_{g}$ passes,
where $G =$ resistance of voltmeter $= 20000Ω$ $∴$ From (i) and (ii)
$\frac{5}{20} = \frac{G}{G + R}$ or $\frac{1}{4} = \frac{G}{G + R}$ or $R = 3 G = 3 \times 20000 = 60000$ or extra resistance $= 60000Ω$ in series

Stream:AIIMSSubject:PhysicsTopic:Current ElectricitySubtopic:Electrical instrument

⏱ 2mℹ️ Source: PYQ_2016

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