A) A permanent magnet moving coil instrument has an internal resistance of 100 and requires a current of 1 mA to reach the full scale deflection (f.s.d.). Determine

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a) A permanent magnet moving coil instrument has an internal resistance of $100 \, \Omega$ and requires a current of $1 \, \text{mA}$ to reach the full scale deflection (f.s.d.). Determine

i) The value of the shunt resistor necessary to extend the range to $500 \, \text{mA}$

Step 1: Identify the given values.
Internal resistance of the meter, $R_m = 100 \, \Omega$.
Full scale deflection current of the meter, $I_m = 1 \, \text{mA} = 0.001 \, \text{A}$.
Desired full scale current, $I =