Q. When a $12\Omega$ resistor is connected with a moving coil galvanometer then its deflection reduces from 50 divisions to 10 divisions. The resistance of the galvanometer is
A) $24\ \Omega$
B) $36\ \Omega$
C) $48\ \Omega$
D) $60\ \Omega$
Explanation
(c) $i_{g} = \frac{iS}{S + G} \Rightarrow 10 = \frac{50 \times 12}{12 + G} \Rightarrow 12 + G = 60 \Rightarrow G = 48\Omega$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.