$A$ $P-N$ junction diode is in forward bias with a current of $10 \ mA$. The potential drop across the diode is $0.5 \ V$. Assuming the current is independent of the potential,what is the maximum voltage of the battery in series with a $200 \ \Omega$ resistor to maintain this forward bias condition? (in $V$)
- A$1.8$
- B$4.2$
- C$2.5$
- D$3$
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