Home
Class 12
PHYSICS
A galvanometer having a resistance of 2...

A galvanometer having a resistance of `20 Omega` 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

`120Omega`

B

`100 Omega`

C

`125 Omega`

D

`80 Omega `

Text Solution

Verified by Experts

The correct Answer is:
D
Since `V = I _(g) . R _(g) [1+ (R_(v))/(R _(g))]`
`15=0.005xx30xx20 [1+ (R _(v))/(20)] " "implies (R_(v))/(20) = (15)/(0.15 xx20) -1 implies R_(v) =80 Omega`
Promotional Banner

Similar Questions

Explore conceptually related problems

A galvanometer having a resistance of 20 Omega and 30 divisible 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 galvanometer having a resistance of 20Omega 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 V , is :

A galvanometer having a resistance of 100 Omega has 25 divisions. A current of 0.4 mA deflect the pointer of the galvanometer into a voltmeter of 0 to 25 V, it should be connected with a resistance of

A voltmeter of resistance 2000 Omega reads 1 volt/division. The resistance required to be connected in series with voltmeter to make it to read 10 volt/divistion is

A voltmeter of resistance 1000 Omega reads 2 volt/ division. The resistance requried to be connected in series with voltmeter to make it to read 20 volt/division is

A galvanometer of internal resistance 100 Omega has a full scale deflection current of 1mA . To convert it into a voltmeter of range 0-10V , the resistance to be connected is

[" The coil of a galvanometer has resistance "G Omega" and "],[" range of "V" volt.In order to extend its range to "nV" volt,"],[" the resistance in ohm,that should be connected in "],[" series is "]

The maximum current that can be measured by a galvanometer of resistance 40 Omega is 10 mA . It is converted into a voltmeter that can read upto 50 V . The resistance to be connected in series with the galvanometer is ... (in ohm )

A galvanometer coil has a resistance 90 Omega and full scale deflection current 10 mA . A 910 Omega resistance is connected in series with the galvanometer to make a voltmeter. If the least count of the voltmeter is 0.1 V the number of divisions on its scale is