A galvanometer with a coil resistance $12 \Omega$ shows a full scale deflection for a current $2.5\;mA$ How will you convert it into a voltmeter of range $7.5 \;V$ Also find the total resistance of Voltmeter formed ?

Question

$\begin{array}{1 1} 3\;\Omega \\ 0.003\;\Omega \\ 300\;\Omega \\ 3000 \;\Omega \end{array} $