Q. A $100\ ohm$ galvanometer gives full scale deflection at $10\ mA.$ How much shunt is required to read $100\ mA$
A) $11.11\ ohm$
B) $9.9\ ohm$
C) $1.1\ ohm$
D) $4.4\ ohm$
Explanation
(a) $i_{g} = i\frac{S}{G + S} \Rightarrow 10 \times 10^{- 3} = \frac{S}{100 + S} \times 100 \times 10^{- 3}$
$90\ S = 1000 \Rightarrow S = \frac{1000}{90} = 11.11\ \Omega$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.