For amplification by a triode, the signal to be amplified

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For amplification by a triode, the signal to be amplified is given to

1. the cathode
2. the grid
3. the glass-envelope
4. the anode

Correct Option: B

The amplifying action of a triode is based on the fact that a small change in grid voltage causes a large change in plate current. The AC input signal which is to be amplified is superimposed on the grid potential.