A galvanometer of resistance 
is connected to a battery of emf 
with 
resistance in series. A full scale deflection of 20 divisions is obtained in the galvanometer. To reduce the deflection to 10 divisions, the resistance in series required is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
C
Let the current which produces full scale deflection in the galvanometer be 
Then 
For half-scale deflection, 
or 
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