Question -
The deflection in a moving cell galvanometer falls from 50 to 10 divisions when a shunt of 12 ohm is connected across it. The resistance of the galvanometer coil is
Options:
A .  24 ohm
B .  36 ohm
C .  48 ohm
D .  60 ohm
Answer: Option C : C If k is the current sensitivity of the galvanometer the current in the galvanometer is lg=50 K when a shunt S is connected across it the current through the galavnometer becomes l′g=lgSG+S=10 K where G is the resistance of the galvanometer dividing the equations we get G+SS=5 which gives G=4×S=4×12=48 ohm
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