If $R_{p} = 7 k ω$ , $g_{m} = 2.5 m i l l i m h o$ , then on increasing plate voltage by $50 V$ , how much the grid voltage is changed so that plate current remains the same?

- 2.86 V

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- 4 V

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+ 4 V

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+ 2 V

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Solution

The correct option is B $- 2.86 V$
By using , $μ = - \frac{Δ V_{p}}{Δ V_{g}} = r_{p} \times g_{m}$
$\Rightarrow 7 \times 10^{3} \times 2.5 \times 10^{- 3} = - \frac{50}{Δ V_{g}}$
$\Rightarrow$ $Δ V_{g} = - 2.86 V$

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If Rp=7kω , gm=2.5millimho , then on increasing plate voltage by 50V, how much the grid voltage is changed so that plate current remains the same?

The correct option is B −2.86VBy using , μ=−ΔVpΔVg=rp×gm⇒7×103×2.5×10−3=−50ΔVg⇒ ΔVg=−2.86V

If $R_{p} = 7 k ω$ , $g_{m} = 2.5 m i l l i m h o$ , then on increasing plate voltage by $50 V$ , how much the grid voltage is changed so that plate current remains the same?

The correct option is B $- 2.86 V$
By using , $μ = - \frac{Δ V_{p}}{Δ V_{g}} = r_{p} \times g_{m}$
$\Rightarrow 7 \times 10^{3} \times 2.5 \times 10^{- 3} = - \frac{50}{Δ V_{g}}$
$\Rightarrow$ $Δ V_{g} = - 2.86 V$