A galvanometer has 30 divisions and a sensitivity ( 16 \mu A... | Physics | SolveeIt | Solveeit

Today, August 18

Question

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

A

resistance nearly $6 kO$ in series

B

$6KO$ in parallel

C

$500O$ in series

D

it cannot be converted

Answer

resistance nearly $6 kO$ in series

Explanation

Solution

Current flowing through the galvanometer
$I_g = 16 \mu A/div \times 30 div$
$= 480 \mu A$
The value of resistance in series to the galvanometer is
$R = \frac{V}{I_g} - G = \frac{3}{480 \times 10^{-6}} - 0$
$= 6.25KO$