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Question

The grid voltage of any triode valve is changed from -1 volt to -3 volt and the mutual conductance is 3× 104 mho. The change in plate circuit current will be

A
0.8 mA
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B
0.6 mA
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C
0.4 mA
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D
1 mA
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Solution

The correct option is B 0.6 mA
gm=ΔIpΔVg
or ΔIp=gm×ΔVg=3×104×[3(1)]
=0.6×103A = shortage of 0.6×103A

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