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Question
A voltmeter has a resistance of 30 Ω. What will be its reading, when it is connected across a cell of emf 2 V having internal resistance 10 Ω?
Solution
Data: E = 2V, r = 10 Ω, R = 30Ω
The voltmeter reading, V = IR
`= ("E"/("R + r"))"R"`
`= (2/(30 + 10))30`
`= (2/40)30`
= 1.5 V
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