The grid in a triode valve is used

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(B) triode valve consists of three electrodes: the cathode,the anode (plate),and the control grid. The control grid is placed between the cathode and

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To control the plate to cathode current

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(B) triode valve consists of three electrodes: the cathode,the anode (plate),and the control grid. The control grid is placed between the cathode and the anode. By applying a negative potential to the grid relative to the cathode,it creates an electric field that opposes the flow of electrons from the cathode to the anode. Thus,the grid acts as a gate to control the magnitude of the plate current.

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