In diode, when there is saturation current, the plate resistance `(r_(p))` is

Options

A. data insufficient
B. zero
C. some finite quantity
D. infinite quantity

Answer

D

Explanation

Key Idea Change in current at saturation is zero.
We know that plate resistance is given by
`r_(p)=(deltaV)/(deltaI)`
where `deltaV` is change in voltage and `deltaI` is change in current.
Also, at saturation change in current is zero.
`therefore r_(p)=(deltaV)/(0)=oo`
Hence, plate resistance will be infinite.