A galvanometer having a resistance of 20 
and 30 divisions on both sides has figure of merit 0.005 ampere/division. The resistance that should be connected in series such that it can be used as a voltmeter upto 15 volt, is :
a.
80 
b.
120 
c.
125 
d.
100 
and 30 divisions on both sides has figure of merit 0.005 ampere/division. The resistance that should be connected in series such that it can be used as a voltmeter upto 15 volt, is :a.
80
b.
120
c.
125
d.
100
Question ID - 50382 | SaraNextGen Top Answer A galvanometer having a resistance of 20 and 30 divisions on both sides has figure of merit 0.005 ampere/division. The resistance that should be connected in series such that it can be used as a voltmeter upto 15 volt, is :
a.
80
b.
120
c.
125
d.
100
A galvanometer having a resistance of 20 and 30 divisions on both sides has figure of merit 0.005 ampere/division. The resistance that should be connected in series such that it can be used as a voltmeter upto 15 volt, is :
|
a. |
80 |
b. |
120 |
|
c. |
125 |
d. |
100 |
1 Answer
127 votes
Answer Key / Explanation : (a) -
Rg = 200 
NL = NR = N = 30
FOM = 
= 0.005 A/Div.
Current sentivity = CS =
= 
Igmax = 0.005 × 30
= 15 × 10−2 = 0.15
15 = 0.15 [20 + R]
100 = 20 + R
R = 80
127 votes
Answer Link
127