In a coil of resistance $100 \Omega$ , a current is induced by changing the magnetic flux through it as shown in the figure. The magnitude of change in flux through the coil is :

Question

$\begin{array}{1 1} (1)\;200\;Wb \\ (2)\;225\;Wb \\ (3)\; 250 \;Wb \\ (4) 275\;Wb \end{array}$