A diode circuit and sinusoidal input signal are shown The di

A diode circuit and sinusoidal input signal are shown. The diode is modeled as an ideal diode in series with a voltage source Vf=0.7V.

take voltage value at 700us

resistor value is now 510

what is diode current, Note answer is not 4.51

From the given graph at t=700microseconds, the input voltage V_in=-2.8 Volts

At V_in=-2.8 Volts, the diode is forward biased an it is ON (Short circuited).
So Current=(0-(-2.8))/R=2.8/510=5.49mA