if there is a change in the operating point, it means there is a change in current through the diode or voltage across the diode or both, and when you change them the resistance will also change
when we apply voltage to a circuit the result in an operating point will not change with time
Q-point is derived from quiescent which means "still or varying"
what will happen tot he DC Resistance when we increase the diode current?
DC resistance will reduced
DC resistance decreases with increase in current through the diode
in reverse bias condition
reverse saturation current is very low and because of that the DC resistance will be high
