A galvanometer has 30 divisions and a sensitivity 16 , A/ div . I… - Vidyadip

MCQ

A galvanometer has $30$ divisions and a sensitivity $16\,\mu A/{\rm{div}}{\rm{.}}$ It can be converted into a voltmeter to read $3\, V$ by connecting

✓
Resistance nearly $6 \,k\,\Omega $ in series
B
$6\,k\,\Omega $ in parallel
C
$500\,\Omega $ in series
D
It cannot be converted

✓

Answer

Correct option: A.

Resistance nearly $6 \,k\,\Omega $ in series

(a) $(R + G)\,{i_g} = V$

$ \Rightarrow $ $(R + G) = \frac{V}{{{i_g}}}$

$ = \frac{3}{{30 \times 16 \times {{10}^{ - 6}}}} = 6.25\,k\Omega $

$\therefore $ Value of $R$ is nearly equal to $6\,k\Omega $

This is connected in series in a voltmeter.

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