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NCERT Class XII Chapter
Moving Charges and Magnetism
Questions With Solutions

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Question : 28
Total: 28
A galvanometer coil has a resistance of 15 Ω and the meter shows full scale deflection for a current of 4 mA. How will you convert metre into an ammeter of range 0 to 6 A?
Solution:  
For converting galvanometer into ammeter of required range, required shunt can be calculated
S =
IgG
I−Ig
 =
4×10−3×15
6−0.004
 = 0.01 Ω = 10 mΩ
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