Question
Physics Question on Moving charges and magnetism
A galvanometer has 40 divisions and a sensitivity of 12 μA/div. it can be converted into a voltmeter to read 3 V by connecting-
A
(A) resistance nearly 6 k Ω in series
B
(B) 6 k Ω in parallel
C
(C) 5 Ω in series
D
(D) 6.6 k Ω in series
Answer
(A) resistance nearly 6 k Ω in series
Explanation
Solution
Explanation:
Current flowing through the galvanometer Ig=12 μA/div × 40 div = 480 μAThe value of resistance in series to the galvanometer isR = VIG-G= 3480×10-6-0 =6.25KΩ