MCQ
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
- A10 volt
- ✓4 volt
- C40 volt
- D100 volt
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$(a)$ The time elapsed before the current acquires half of its steady - state value
$(b)$ The energy stored in the magnetic field associated with the coil at an instant $15\,ms$ after the circuit is switched on. (Given In $2=0.693$, $\left.e ^{-3 / 2}=0.25\right)$



