NCERT Class XII Chapter
Moving Charges and Magnetism
Questions With Solutions

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Question : 27
Total: 28
A galvanometer coil has a resistance of 12 Ω and the metre shows full scale deflection for a current of 3 mA. How will you convert metre into a voltmeter of range 0 to 18 V?
Solution:  
By using the formula
RV =
V
Ig
- G
We can calculate required resistance to be connected in series.
RV =
18
3×103
- 12 = 5988 Ω
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