$A$ serious drawback of semiconductor devices is:

  • A
    They cannot be used with high voltage
  • B
    They pollute the environment
  • C
    They are costly
  • D
    They do not last for a long time

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The grid voltage of any triode valve is changed from $-1 \, V$ to $-3 \, V$ and the mutual conductance is $3 \times 10^{-4} \, \text{mho}$. The change in plate circuit current will be ..... $mA$.

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