Two metal plates are lowered into a vessel with a sulfuric acid solution. Will such a device be a galvanic cell if both plates are zinc?

Two metal plates are lowered into a vessel with a sulfuric acid solution. Will such a device be a galvanic cell if both plates are zinc? if one of the plates is zinc and the other is copper?

The described device will be a galvanic cell only if the plates are made of different metals.

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