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Which of the following corrosion form is considered as the intermediate stage between uniform corrosion and complete corrosion resistance?

Which of the following corrosion form is considered as the intermediate stage between uniform corrosion and complete corrosion resistance? Correct Answer Pitting corrosion

Case A: No corrosion of metal Case B: Intense pitting on specific points Case C: Uniform corrosion

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An amplifier is measured to have an internal resistance of 10 kΩ, voltage gain of 100V/V and output resistance of 100 Ω. Also, when a load resistance of 1 kΩ is connected between the output resistance if found to decrease to 8 kΩ. If the amplifier is fed with the signal source having an internal resistance of 2 kΩ. Find Av.
An amplifier is measured to have an internal resistance of 10 kΩ, voltage gain of 100V/V and output resistance of 100 Ω. Also, when a load resistance of 1 kΩ is connected between the output resistance if found to decrease to 8 kΩ. If the amplifier is fed with the signal source having an internal resistance of 2 kΩ. Find Gvo.