waajib muttasil and jaaiz munfasil, what's the difference between the two?

waajib muttasil and jaaiz munfasil,what's the difference between the two?
The waajib Al-Muttasil is when the medd letter is followed by a hamzah in the same word (as in ), and in the jaa'iz al-Munfasil, the medd letter is the last letter in one word, and the first letter of the following word is a hamzah ( as in: ).  Please see:
http://www.abouttajweed.com/index.php/tajweed-rules/49-the-mudood-the-lengthenings/109-the-mudood-lengthenings-part-5 and