SATHEE: Current Electricity 4 Question 3

Current Electricity 4 Question 3

3. A galvanometer whose resistance is $50 Ω$ , has 25 divisions in it. When a current of $4 \times 10^{- 4} A$ passes through it, its needle (pointer) deflects by one division. To use this galvanometer as a voltmeter of range $2.5 V$ , it should be connected to a resistance of

(Main 2019, 12 Jan II)

(a) $250 Ω$

(b) $6200 Ω$

(d) $6250 Ω$

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Solution:

Current for deflection of pointer by

1 division $= 4 \times 10^{- 4} A$

So, current for full-scale deflection $= I_{g}$ $=$ Number of divisions $\times$ Current for 1 division $\Rightarrow I_{g} = 25 \times 4 \times 10^{- 4} = 1 \times 10^{- 2} A$

Now, let a resistance of $R$ is put in series with galvanometer to make it a voltmeter of range $2.5 V$ .

Then,

$\begin{aligned} I_{g} (R + G) & = V_{A B} \\ 1 \times 10^{- 2} (R + 50) & = 2.5 \end{aligned}$

$[∵$ Given, $G = 50 Ω, V_{A B} = 2.5 V]$

$∴ R = 250 - 50 = 200 Ω$

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Current Electricity 4 Question 3

3. A galvanometer whose resistance is $50 Ω$ , has 25 divisions in it. When a current of $4 \times 10^{- 4} A$ passes through it, its needle (pointer) deflects by one division. To use this galvanometer as a voltmeter of range $2.5 V$ , it should be connected to a resistance of

Solution:

इंजीनियरिंग की तैयारी

चिकित्सा तैयारी

एनसीईआरटी पुस्तकें और समाधान

महत्वपूर्ण संसाधन

अन्य संसाधन

पाठ्यक्रम

परीक्षा मंच

नमूना मॉक टेस्ट

सदस्यता

एनसीईआरटी व्यायाम वीडियो समाधान

Current Electricity 4 Question 3

3. A galvanometer whose resistance is 50Ω, has 25 divisions in it. When a current of 4×10−4A passes through it, its needle (pointer) deflects by one division. To use this galvanometer as a voltmeter of range 2.5V, it should be connected to a resistance of

Solution:

इंजीनियरिंग की तैयारी

चिकित्सा तैयारी

एनसीईआरटी पुस्तकें और समाधान

महत्वपूर्ण संसाधन

अन्य संसाधन

पाठ्यक्रम

परीक्षा मंच

नमूना मॉक टेस्ट

सदस्यता

एनसीईआरटी व्यायाम वीडियो समाधान

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3. A galvanometer whose resistance is $50 Ω$ , has 25 divisions in it. When a current of $4 \times 10^{- 4} A$ passes through it, its needle (pointer) deflects by one division. To use this galvanometer as a voltmeter of range $2.5 V$ , it should be connected to a resistance of