Please explain to me about this:

Is the tongue more relax and wider in pronouncing the consonant n than in pronouncing the consonant t?

In pronouncing light L, does the body of tongue have slightly cylinder shape or flat shape? If it has flat shape,does the blade(the side) of tongue curve up or down or not curve any at all(to make a free space between the front part of tongue and the other part of mouth)?In pronouncing L the tongue is more tense or more relax in comparison with that in pronouncing t?

Between th and t, in pronouncing of which the tongue is more relax?

Of course, the form of tongue in pronouncing a consonant depends on other letters in a word.But knowing exactly the form of tongue in single consonant still very important to ease the listening work.