First slide

Moving coil Galvanometer

Question

A galvanometer has 30 divisions and sensitivity $16 μA / div .$ It can be converted into a voltmeter to read 3 V by connecting

Moderate

A

resistance nearly $6 k Ω$ in series
B

$6 k Ω$ in parallel
C

$500 Ω$ in series
D

It cannot be converted

Solution

$(R + G) i_{g} = V \Rightarrow (R + G) = \frac{V}{i_{g}}$
$= \frac{3}{30 \times 16 \times 10^{- 6}} = 6 .25 kΩ$
$∴$ Value of R is nearly equal to $6 k Ω$
This is connected in series with a galvanometer.

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