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An ammeter is obtained by shunting a 30 ...

An ammeter is obtained by shunting a `30 Omega` galvanometer with a `30 Omega` resistance. What additional shunt should be connected across it to double the range ?

A

`25 Omega`

B

`20 Omega`

C

`15 Omega`

D

`10 Omega`

Text Solution

Verified by Experts

The correct Answer is:
C
G and S are in parallel. `therefore` Their combined resistance`R=15Omega` The range is to be doubled i.e. `n=I/I_g=2` Shunt resistance `S=R/(n-1)=15/(2-1)=15 Omega`.
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MARVEL PUBLICATION-MAGNETIC EFFECTS OF ELECTRIC CURRENT-MCQ
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  10. A galvanometer has a sensitivity of 60 division/ampere. When a shunt i...

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  13. By mistake, a voltmeter is connected in series and an ammeter is conne...

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  14. An ammeter has an internal resistance of 50 Omega when it is connected...

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  15. A galvanometer whose resistance is 120 Omega gives full scale deflecti...

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  16. When a resistance of 100Omega is connected in series with a galvanomet...

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  17. A moving coil galvanometer is converted into an ammeter reads upto 0.0...

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