Yes, there can only be one active at any one time.
If you already have a Field Spell active, you can replace it with another, the first is destroyed when you activate the second. If the opponent has one, then it is destroyed when you Field Spell card resolves.
Field Spell cards can be set while another is active. Since the rule only affects active Field Spells, set cards are not destroyed by your opponent setting or activating a Field Spell card.
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No. If Field Barrier is on the field, the Field Spell Card will be unaffected by the effect of Heavy Storm.Because Heavy Storm destroys all Spell and Trap Cards simultaneously, Field Barrier acts as a shield for the Field Spell Card, preventing it from being destroyed.To destroy the Field Spell Card, the Player must destroy Field Barrier FIRST. Effects that supposedly destroy both at the same time, such as Heavy Storm and Harpie's Feather Duster, do not affect the Field Spell Card.
Yes. One of the few times when you can voluntarily destroy one of your own cards, is when you wish to replace your Field Spell Card with either another active one, or even a Set one.
Firstly, to be clear, Scapegoats is placed on the field when it is activated, remains there until resolution, and then goes to the graveyard when the chain finishes resolving. It does not stay on the field after that. The tokens it summons are totally separate things to the spell card itself. Chaining MST to Scapegoats' activation will in no way affect the resolution, it will resolve no differently to how it usually does.
Depends on the field spell. Inherently, Armityle has no effect that says he is immune to the effect of field spell cards.
A Field Spell (which is played on the Field Card Zone in the upper-left corner of your Game Mat) affects the whole field by its card effect. For example, Mountain ups the ATK and DEF of all Dragon, Winged Beast, and Thunder-type monsters on the fieldby 200 points.Destroy a Field Spell by replacing it with another Field Spell or with a card effect (like MST).