NEET 2008 Physics question
A galvanometer of resistance is connected to a battery of 3 V along with a resistance of in series. A full scale deflection of 30 divisions is obtained in the galvanometer. In order to reduce this deflection to 20 divisions, the resistance in series should be
Answer: (1)
Solution
The deflection is proportional to the current. For 30 divisions: A. For 20 divisions the current must be A, so $ =
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