T h e current gain α’of NPN transistor is 0.98. It is connected in the CB mode & gives a reverse saturation current Ico =12μA. Then the base current for an emitter current of 2mA will be _______(in μA ).Correct answer is '28'. Can you explain this answer?

Question

T h e current gain &alpha;&rsquo;of NPN transistor is 0.98. It is connected in the CB mode & gives a reverse saturation current Ico =12&mu;A. Then the base current for an emitter current of 2mA will be _______(in &mu;A ).Correct answer is '28'. Can you explain this answer?

Answer

The current gain, also known as the amplification factor or beta, is a measure of how much a transistor can increase the current flowing through it. It is defined as the ratio of the collector current (Ic) to the base current (Ib), and is denoted by the symbol β.

The current gain is an important parameter in transistor circuits, as it determines the amount of amplification that can be achieved. A high current gain means that a small base current can control a large collector current, resulting in significant amplification.

The current gain of a transistor varies with the amount of current flowing through it, as well as other factors such as temperature and the specific characteristics of the transistor itself. It is typically specified as a range of values, rather than a single number.

In practical applications, the current gain of a transistor is usually optimized for a specific purpose, such as amplification or switching. Different types of transistors have different current gain values, and choosing the right one for a given application is critical to achieving the desired performance.

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