A galvanometer has a resistance of 30 ohm and a current of 2 mA is needed to give a full-scale deflection. What is the resistance needed and how is it to be connected to convert the galvanometer.
Text Solution
Verified by ExpertsThe correct answer is:
CHECK THE SOLUTION.
[ S = 
= 0.2013 Ω Ω
R = 70 Ω Ω ]
Sol.
(I – I g ) S = I g G
⇒ S = 
G
S = 
30 = 
S = 
= 0.2013 Ω Ω
V = I g (R + G)
⇒ 0.2 = 0.002 (R + 30)
R = 70 Ω Ω
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