For a triode, at $V_g=-1$ volt, the following observations were taken $V_p=75 V , I_p=2 mA ,  V_p=100 V , I_p=4 mA$. The value of plate resistance will be
  • A$25 k \Omega$
  • B$20.8 k \Omega$
  • C$12.5 k \Omega$
  • D$100 k \Omega$
[MP PMT 1989]
art

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