To send 10% of the main current through a moving coil galvanometer of resistance 99 Ω the shunt required is ___________.
A. 11 Ω
B. 9 Ω
C. 100 Ω
D. 9 Ω
Answer: Option A
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Common mode rejection ratio is defined as ratio of
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M=I/0.1I
M=1
R=99/(10-1)
R=11