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The plate resistance and the amplificati...

The plate resistance and the amplification factor of a triode are `10 kOmega and 20`. The tube is operated at plate voltage `250 V` and grid voltage `-7.5 V`. The plate current is `10 mA`. (a) To what value should the grid voltage be changed so as to increase the plate current to `15 mA`? (b) To what value should the plate voltage be changed to take the plate current back to `10 mA`?

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