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Question: If \(R_{p} = 7K\Omega,g_{m} = 2.5\) millimho, then on increasing plate voltage by\(50V\), how much t...

If Rp=7KΩ,gm=2.5R_{p} = 7K\Omega,g_{m} = 2.5 millimho, then on increasing plate voltage by50V50V, how much the grid voltage is changed so that plate current remains the same.

A

– 2.86 V

B

– 4 V

C
  • 4 V
D
  • 2 V
Answer

– 2.86 V

Explanation

Solution

By using μ=−ΔVpΔVg=rp×gm\mu = - \frac{\Delta V_{p}}{\Delta V_{g}} = r_{p} \times g_{m}

⇒7×103×2.5×10−3=−50ΔVg⇒ΔVg=−2.86V\Rightarrow 7 \times 10^{3} \times 2.5 \times 10^{- 3} = - \frac{50}{\Delta V_{g}} \Rightarrow \Delta V_{g} = - 2.86V.