Q. An ammeter gives full scale deflection when current $1.0\ A$ is passed in it. To convert it into $10\ A$ range ammeter, the ratio of its resistance and the shunt resistance will be
A) 1 : 9
B) 1 : 10
C) 1 : 11
D) 9 : 1
Explanation
(d) $S = \frac{i_{g}G}{(i - i_{g})} \Rightarrow \frac{G}{S} = \frac{i = i_{g}}{i_{g}} = \frac{10 - 1}{1} = \frac{9}{1}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.