Q. A $50\ ohm$ galvanometer gets full scale deflection when a current of $0.01\ A$ passes through the coil. When it is converted to a $10\ A$ ammeter, the shunt resistance is
A) $0.01\ \Omega$
B) $0.05\ \Omega$
C) $2000\ \Omega$
D) $5000\ \Omega$
Explanation
(b) $i_{g} = i\frac{S}{G + S} \Rightarrow \frac{0.01}{10} = \frac{S}{50 + S} \Rightarrow S = \frac{50}{999} = 0.05\Omega$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.