A galvanometer of resistance is connected to a battery of
along with a resistance
in series. A full deflection of 30 divisions is obtained in the galvanometer. In order to reduce this deflection to 20 divisions, the resistance in series should be
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
C
Total initial resistance
Current,
If the deflection has to be reduced to 20 divisions, then current,
Let be the effective resistance of the circuit,
or
Resistance to be added
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