Question 539: Current Electricity

Question

A galvanometer of resistance $20 ~\Omega$ gives a deflection of 5 divisions when $1 \mathrm{~mA}$ current flows through it. The galvanometer scale has 50 divisions. To convert the galvanometer into a voltmeter of range 25 volt, we should connect a resistance of

Accepted Answer

$\begin{aligned}
& \mathrm{R}=\frac{\mathrm{V}}{\mathrm{I}_{\mathrm{g}}}-\mathrm{G} \
& 	ext { Here, } \mathrm{I}_{\mathrm{g}}=\frac{50}{5}=10 \mathrm{~mA} \
	herefore \quad \mathrm{R} & =\frac{25}{10 	imes 10^{-3}}-20 \
& =2480 \Omega 	ext { in series }
\end{aligned}$

Answer

$1240 ~\Omega$ in series.

Answer

$2480 ~\Omega$ in series.

Answer

$2480 ~\Omega$ in parallel.

Answer

$20 ~\Omega$ in parallel.

Current Electricity

A galvanometer of resistance 20 ~\Omega gives a deflection of 5 divisions when 1 \mathrm{~mA} current flows through it. The galvanometer scale has 50 divisions. To convert the galvanometer into a voltmeter of range 25 volt, we should connect a resistance of

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