In $P-N$ junction, avalanche current flows in circuit when biasing is
A
Forward
B
Reverse
C
Zero
D
Excess
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B
Reverse
At a particular reverse voltage in $P N$-junction, a huge current flows in reverse direction known as avalanche current.
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The amplification factor of a triode is $20.$ If the grid potential is reduced by $0.2$ volt then to keep the plate current constant its plate voltage is to be increased by