Calculate the current through the given circuit. (The diodes are ideal)

$D_1$ is reversed biased (No current flow)

$D_2$ is forward biased (current flow)

$E_o$ total resistance$=R_L+R_{D_2}$

$R_{total}=5\Omega +10\Omega$

$=15\Omega$

 current through the circuit

$\frac{V}{R}$Ohm's law

$=\frac{30V}{15\Omega }=2A$