A galvanometer with a coil resistance $12.0 \Omega$ shows a full scale deflection for a current $2.5\;mA$ How it can be converted into an ammeter of range $7.5 \;A$ What will be resistance of ammeter formed ?

Question

$\begin{array}{1 1} 4 \times 10^3 \;\Omega \\ 4 \times 10^2\;\Omega \\ 4 \times 10^{-3}\;\Omega \\ 4 \times 10^{-2}\;\Omega \end{array} $