A galvanometer of resistance 
is connected to a battery of 
along with a resistance of 
in series shows full-scale deflection of 30 divisions. The additional series resistance required to reduce the deflection to 20 divisions is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
B
Let current per division be I
For full scale deflection,
When additional series resistance 
is connected,
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