In the circuit of a triode valve, there is no change in the plate current, when the plate potential is increased from $200$ volt to $220$ volt and the grid potential is decreased from $-0.5$ volt to $-1.3$ volt. The amplification factor of this valve is
  • A$15$
  • B$20$
  • C$25$
  • D$35$
[MP PMT 1989]
art

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