# A transistor having a $\beta$ to $80$ has a change in base current of $250\; \mu A$ then the change in collector current is :
$\begin {array} {1 1} (1)\;20,000\;mA & \quad (2)\;200\;mA \\ (3)\; 2000\;mA & \quad (4)\;20\;mA \end {array}$