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A voltmeter with resistance 500 Omega is...

A voltmeter with resistance `500 Omega` is used to measure the emf of a cell of internal resistance `4 omega`, percentage error in the reading of the voltmeter will be

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`V=E-ir`
`therefore" Percentage error "=(DeltaE)/(E)xx100=(ir)/(E)xx100`
`=((E)/(R+r)r)/(E)xx100=((r)/(R+r))xx100`
`=((4)/(500+4))xx100=0.8%`
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