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

Options

A. Resistance nearly `6 k Omega` in series
B. `6 k Omega` in parallel
C. `500 Omega` in series
D. It cannot be converted

Answer

A

Explanation

(a) `(R + G) i_(g) = V implies (R + G) = (V)/(i_(g))`
`= (3)/(30 xx 16 xx 10^(-6)) = 6.25 k Omega`
`:.` Value of `R` is nearly equal to `6 k Omega`
This is connected in series in a voltmeter.