A galvanometer of resistance 100 
has 50 divisions on its scale and has sensitivity of 20 
A/division. It is to be converted to a voltmeter with three ranges, of 0−2 V, 0−10 V and 0−20 V. The appropriate circuit to do so is :
a)
b)
c)
d)
has 50 divisions on its scale and has sensitivity of 20 A/division. It is to be converted to a voltmeter with three ranges, of 0−2 V, 0−10 V and 0−20 V. The appropriate circuit to do so is :a)
b)
c)
d)
Question ID - 51434 | SaraNextGen Top Answer A galvanometer of resistance 100 has 50 divisions on its scale and has sensitivity of 20 A/division. It is to be converted to a voltmeter with three ranges, of 0−2 V, 0−10 V and 0−20 V. The appropriate circuit to do so is :
a)
b)
c)
d)
A galvanometer of resistance 100 has 50 divisions on its scale and has sensitivity of 20 A/division. It is to be converted to a voltmeter with three ranges, of 0−2 V, 0−10 V and 0−20 V. The appropriate circuit to do so is :
|
a) |
|
b) |
|
|
c) |
|
d) |
|
1 Answer
127 votes
Answer Key / Explanation : (a) -
For R1
Ig = 10–3 A
10−3(R1 + 100) = 2 V ⇒R1 = 1900
For R2
10−3(R1 + R2 + 100) = 10 V
⇒ R1 + R2 + 100 = 10000
⇒ R2 = 8000
For R3
10−3(R1 + R2 + R3 + 100) = 20 V
⇒ R1 + R2 + R3 + 100 = 20 
1000
⇒ R3 = 10000
127 votes
Answer Link
127