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what i mean to say is that the required potential value is of the instant the current reaches the diode. if we use a working diode circuit then we woun't be able to spot that one value as with the passage of current through the diode the value will change. however when current is blocked by the diode then for an instant the current does reach the diode and that instant is recorded, regardless of the fact whether the current keeps flowing through or is blocked.Do you mean that in D, the current would be blocked except when the emf is high enough, at THAT point the current will start passing and the reading on the voltmeter will give the initial voltage which we're looking for? Whereas in A the current will keep passing anyway because of the position of the diode so the voltage reading won't be that of the diode when it begins to conduct. Is that what you meant? If so then I got it!
that is what i understood but anyone if u think it is the wrong answer or there is another CORRECT explanation to the point PLZ help and correct both of us