A galvanometer has a $50$ division scale. Battery has no internal resistance. It is found that there is deflection of $40$ divisions when $R=2400 Ω$. Deflection becomes $20$ divisions when resistance taken from resistance box is $4900 Ω$. Then we can conclude :

Question

$\begin{array}{1 1}(1)\; Resistance\; of \;galvanometer \;is \;200 Ω \\ (2)\; Full \;scale \;deflection \;current \;is \;2 \;mA. \\ (3)\; Current \;sensitivity \;of \;galvanometer \;is \;20 \;µA\;/division.\\ (4)\; Resistance \;required \;on \;R.B. \;for \;a \;deflection \;of \;10 \;divisions \;is \;9800 Ω. \end{array}$