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An RC coupling circuit is an example of what type of filter?

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An RC coupling circuit is an example of what type of filter?

(a) Low pass filter

(b) High pass filter

(c) Band pass filter

(d) All pass filter

This question was addressed to me in an international level competition.

My question is based upon Filters in chapter Fundamentals of Electronics of Avionics

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The correct answer is (b) High pass filter

The explanation: An RC coupling circuit is an example of a high-pass filter because the AC component of the input voltage is developed across R and the DC voltage is blocked by the series capacitor. Furthermore, with higher frequencies in the AC component, more AC voltage is coupled.

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