For an $\text{npn}$ transistor connected as shown in the figure, $V_{B E}=0.7$ volts. Given that reverse saturation current of the junction at room temperature $300^{\circ} \mathrm{K}$ is $10^{-13} \mathrm{~A}$, the emitter current is
- $30 \mathrm{~mA}$.
- $39 \mathrm{~mA}$.
- $49 \mathrm{~mA}$.
- $20 \mathrm{~mA}$.