If you routinely take 2-3 seconds before each play of the cards, that is ethical. If you usually play cards more quickly, but take a pause when you have a problem, that is ethical.

If, on the other hand, you usually play cards more quickly, take a pause when you have a problem, and sometimes take a pause when you don't have a problem to throw declarer off, this is unethical. Even though your partner is not entitled to know when you have a problem, declarer is entitled to know. Pausing in order to mislead declarer is called "coffee-housing." It is unethical because in bridge only your actual plays should mislead declarer. It is related to the idea that you and your partner may not have secret bidding agreements. Bridge is not poker; you are not trying to bluff your opponents based on your demeanor.

Why is this type of hesitation considered unethical?
I was wondering what would happen to capacitance if the plates are not parallel (above/below each other) or if the plates are not the same size. Thanks.
