Current Electricity Charging Discharging Of Capacitors Question 249
Question: A galvanometer whose resistance is $ 120,\Omega $ gives full scale deflection with a current of 0.05 A so that it can read a maximum current of 10 A. A shunt resistance is added in parallel with it. The resistance of the ammeter so formed is
[Bihar MEE 1995]
Options:
A) $ 0.06,\Omega $
B) $ 0.006,\Omega $
C) $ 0.6,\Omega $
D) $ 6,\Omega $
Show Answer
Answer:
Correct Answer: C
Solution:
Resistance of shunted ammeter $ =\frac{GS}{G+S} $ Also $ \frac{i}{i _{g}}=1+\frac{G}{S} $
Therefore $ \frac{GS}{G+S}=\frac{i _{g}.G}{i} $
Therefore $ \frac{GS}{G+S}=\frac{0.05\times 120}{10} $ = 0.6 W
BETA
