Q. A moving coil galvanometer of resistance 100$\Omega$is used as an ammeter using a resistance 0.1$\Omega$. The maximum deflection current in the galvanometer is 100$\mu$A. Find the minimum current in the circuit so that the ammeter shows maximum deflection
A) 100.1mA
B) 1000.1mA
C) 10.01mA
D) 1.01mA
Explanation
(a) $V_{ab} = i_{g}.G = \left( i - i_{g} \right)S$
$\therefore\ \ i = \left( 1 + \frac{G}{S} \right)i_{g}$
Substituting the values we get,
$i = 100.1mA$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.