what happen when two conductors are touched
Nothing, unless they are conducting something like electricity. Coins are usually made from metal and are conductors but nothing happens when they touch or even when you hold them. You're question needs more information. Many things can happen depending on what and how much is being conducted.
If a conductor is connected to some source of electricity DO NOT TOUCH it unless you know for sure that it is safe. A high value current of electricity can kill you or burn you.
Notice that good conductors of electricity are normally also good conductors of heat, the metals for example.
If two conductors are applied by the electricity, will be spark and spoil or burn. If you are not aware this, it is very dangerous. Don't test it.
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