If $R_p=7 K \Omega, g_m=2.5$ millimho, then on increasing plate voltage by $50 V$, how much the grid voltage is changed so that plate current remains the same
  • A$-2.86\ V$
  • B$-4\ V$
  • C$+4\ V$
  • D$+2\ V$
[RPET 1996]
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