If Q of an LC circuit increases, then bandwidth ___________

The correct answer is: A. Increases

The bandwidth of an LC circuit is the range of frequencies over which the circuit can pass an AC signal without significant attenuation. The Q factor of an LC circuit is a measure of its quality, and it is inversely proportional to the bandwidth. Therefore, as the Q factor increases, the bandwidth decreases.

Here is a more detailed explanation of each option:

• Option A: Increases. This is the correct answer. As the Q factor increases, the bandwidth decreases. This is because the higher the Q factor, the more selective the circuit is to a particular frequency.
• Option B: Decreases. This is the opposite of the correct answer. As the Q factor increases, the bandwidth decreases. Therefore, this option is incorrect.
• Option C: Remains the same. This is also incorrect. As the Q factor increases, the bandwidth decreases. Therefore, this option is incorrect.
• Option D: Insufficient data. This is incorrect because there is enough data to answer the question. The question states that the Q factor of an LC circuit increases. This information is sufficient to answer the question.