Which one of the following statements is not correct
A
A diode does not obey Ohm's law
BA $P N$ junction diode symbol shows an arrow identifying the direction of current (forward) flow
C
An ideal diode is an open switch
D
An ideal diode is an ideal one way conductor
[SCRA 2000]
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C
An ideal diode is an open switch
Diode acts as open switch only when it is reverse biased
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The amplification factor of a triode is $20$ and trans-conductance is $3$ milli mho and load resistance $3 \times 10^4\ \Omega$, then the voltage gain is