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  • .An ammeter is obtained by shunting a 30  galvanometer with a 30<img alt="\Omega" src="https://entrancecorner

.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?

Option: 1

15 \Omega


Option: 2

10 \Omega


Option: 3

5 \Omega


Option: 4

None of these


Answers (1)

Total range is doubled, i.e., \mathrm{ 4 I_{g}}
Now shunt required, \mathrm{ S=\frac{I_{\mathrm{g}}}{4 I_{\mathrm{g}}-I_{\mathrm{g}}} \times G=10 \Omega}
 

\mathrm{ \frac{1}{30}+\frac{1}{x}=\frac{1}{10} \Rightarrow x=15 \Omega }

Posted by

Sumit Saini

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