A galvanometer of resistance ${\rm{20}}\,\,{\rm{\Omega }}$ shows a deflection of ${\rm{10}}$ divisions when a current of ${\rm{1}}\,\,{\rm{mA}}$ is passed through it. If a shunt of ${\rm{4}}\,\,{\rm{\Omega }}$ is connected and there are ${\rm{50}}$ divisions on the scale, the range of the galvanometer is

$\begin{array}{*{20}{l}} {{\rm{1}}\,\,{\rm{A}}\,\,} \end{array}$

$\begin{array}{*{20}{l}} {{\rm{3}}\,\,{\rm{A}}\,\,} \end{array}$

JEE PHYSICS MCQ: MAGNETIC EFFECT OF CURRENT

1 Medium

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Application +4 | -1

A galvanometer of resistance

\mathrm{20}\,\,\mathrm{\Omega }

shows a deflection of

\mathrm{10}

divisions when a current of

\mathrm{1}\,\,\mathrm{mA}

is passed through it. If a shunt of

\mathrm{4}\,\,\mathrm{\Omega }

is connected and there are

\mathrm{50}

divisions on the scale, the range of the galvanometer is

View answer and explanation

Correct option: D

\mathrm{30}\,\,\mathrm{mA}

Option D (

\mathrm{30}\,\mathrm{mA}

) is correct because it is the calculated range of the galvanometer after connecting the shunt resistance.

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