A galvanometer having 50 divisions provided with a variable shunt S is used to measure the current when connected in series with a resistance of 90 Ω Ω and a battery of internal resistance 10 Ω Ω . It is observed that when the shunt resistances are 10 Ω Ω & 50 Ω Ω respectively, the deflection are respectively 9 and 30 divisions. What is the resistance of the galvanometer? Further, if the full scale deflection of the galvanometer movement require 200 mA, find the emf of the cell.
Text Solution
Verified by ExpertsCHECK THE SOLUTION.
(R g = 
Ω Ω , E = 96 volt.)
Sol.
Here I = 
and I g = 
I g = 
for S = 10 Ω Ω , I g = 
× 200 × 10 –3 = 36 × 10 –3 amp
36 × 10 –3 = 
....(1)
for S = 50 Ω Ω , I g = 
× 200 × 10 –3 = 120 × 10 –3 amp
120 × 10 –3 = 
....(2)
from (1) and (2)
G = 
Ω Ω Ans.
from eq (1) E = 96 V Ans.
Prepare Smarter with CGP Edu
Get practice questions, solutions, and test series in one place.
Write a Review
Share your experience with this question and solution.
Commentary
Send your comment, doubt, correction, or feedback to admin.
Similar Questions
Explore conceptually related problems