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महाराष्ट्र राज्य शिक्षण मंडळएचएससी विज्ञान (सामान्य) इयत्ता १२ वी

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?

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प्रश्न

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?

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उत्तर

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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पाठ 9: Current Electricity - Exercises [पृष्ठ २२९]
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