NEET 2010 Physics question
A galvanometer has a coil of resistance 100 ohm and gives a full scale deflection for 30mA current. If it is to work as a voltmeter of 30 volt range, the resistance required to be added will be
Answer: (1)
Solution
To convert a galvanometer into a voltmeter, a high resistance is connected in series so that the full-scale current flows at the full range voltage : I_g(G\dfrac{V}{I_g}$ - G =
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