A milli voltmeter of $25\,millivolt$ range is to be converted in to an ammeter of $25\,A$ range. The value (in $ohm$) of necessary shunt will be
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Most of current passes through shunt
$25 \times {10^{ - 3}} = 25{{\rm{R}}_{\rm{s}}}$
$ \Rightarrow {{\rm{R}}_{\rm{s}}} = 0.001$
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