[amp_mcq option1=”2 mA” option2=”0.5 mA” option3=”2:00 AM” option4=”200 A E. None of the above” correct=”option3″]
The correct answer is $\boxed{\text{B. 0.5 mA}}$.
The current gain of a transistor is the ratio of the collector current to the base current. In this case, the current gain is 200, which means that for every 1 mA of base current, there will be 200 mA of collector current. So, if the collector current is 100 mA, then the base current must be 0.5 mA.
Option A is incorrect because 2 mA is not a multiple of 200. Option C is incorrect because 2:00 AM is not a current. Option D is incorrect because 200 A is much larger than the typical base current of a transistor. Option E is correct, but it is not the most specific answer.