1)

When a current of 5 mA is passed through a galvanometer having a coil of resistance 15Ω, 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) $2.045 \times 10^{3}$O

B) $2.535 \times 10^{3}$O

C) $4.005 \times 10^{3}$O

D) $1985 \times 10^{3}$O

Answer:

Option D

Explanation:

Suppose a resistance Rs is connected in series with a galvanometer to convert it into a voltmeter.

25102019723_dia.PNG

  $I_{g}(G+R_{s})=V$

$R=\frac{V}{I_{g}}-G$

$\Rightarrow R=1985=1985k$Ω

   or 1985 × 103Ω