Current Electricity Ques 75
- When a current of $5$ $ mA$ is passed through a galvanometer having a coil of resistance $15 $ $\Omega$, it shows full scale deflection. The value of the resistance to be put in series with the galvanometer to convert it into a voltmeter of range $0-10$ $ V$ is
(a) $2.045 \times 10^{3} $ $\Omega$
(b) $2.535 \times 10^{3}$ $ \Omega$
(c) $4.005 \times 10^{3} $ $\Omega$
(d) $1.985 \times 10^{3} $ $\Omega$
(2017 Main)
Show Answer
Answer:
Correct Answer: 75.(d)
Solution:
Formula:
- For a voltmeter,
$ I _g\left(G+R _s\right)=V \Rightarrow R=\frac{V}{I _g}-G $
$ \Rightarrow \quad R=1985=1.985 $ $\mathbf{k} \Omega \text { or } R=1.985 \times 10^{3}$ $ \Omega $
BETA
