NEET 2011 Physics question
A galvanometer of resistance, is shunted by a resistance ohm. To keep the main current in the circuit unchanged, the resistance to be put in series with the galvanometer is :
Answer: (3)
Solution
The shunt is in parallel with , so the combination has resistance . The main current stays the same only if the total resistance of the branch remains (the original galvanometer resistance). Let a series resistance
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