[amp_mcq option1=”20 k Ohm or more” option2=”200 k Ohm or less” option3=”200 k Ohm or more” option4=”20 km or less E. None of the above” correct=”option1″]
The correct answer is A. 20 k Ohm or more.
A current source is a device that maintains a constant current regardless of the load resistance. The internal resistance of a current source is the resistance of the source itself. The ideal current source has an infinite internal resistance, which means that the current through the load is independent of the load resistance.
In this case, the current source has an ideal current of 10 mA and an internal resistance of 20 MW. The current through the load will be 10 mA regardless of the load resistance, as long as the load resistance is greater than 20 kΩ. This is because the internal resistance of the current source is much greater than the load resistance.
If the load resistance is less than 20 kΩ, the current through the load will be less than 10 mA. This is because the current through the load will be divided between the load resistance and the internal resistance of the current source. The higher the load resistance, the less current will flow through the load.
Therefore, the current source will appear stiff for load resistances greater than 20 kΩ.