The full-scale deflection current of an ammeter is 1 mA and its internal resistance is 100 ohms. If this meter is to have full deflection a…

Given that, full scale deflection of ammeter (Im) = 1 mA

Internal resistance (Rm) = 100 ohms

Required full deflection (I) = 5 A

$({R_{sh}} = \frac{{{R_m}}}{{\left( {\frac{I}{{{I_m}}} - 1} \right)}} = \frac{{100}}{{\left( {\frac{5}{{1 \times {{10}^{ - 3}}}} - 1} \right)}} = \frac{1}{{49.99}}ohms)$