Final answer:
The statement about the wet electrolytic capacitor is false, as the dielectric in such capacitors is an oxide layer and not a fluid. Inserting a dielectric material between the capacitor plates reduces the electric field and increases capacitance, which is true.
Step-by-step explanation:
The statement that a wet electrolytic capacitor contains a positive capacitor plate suspended in a metal can filled with dielectric fluid, with the can serving as the negative plate, is false. In wet electrolytic capacitors, the dielectric is not a fluid but an oxide layer formed on the surface of the metal anode. The anode is immersed in a liquid electrolyte solution which acts as the cathode. It is important to note that electrolytic capacitors have high capacitance and should be oriented correctly in a circuit due to their polarity.
When a dielectric is inserted between the plates of a capacitor, it reduces the electric field strength, which in turn results in a smaller voltage between the plates for the same charge. This implies that the capacitor's capacitance is larger because of the dielectric. Hence, the statement that the electric field in an air-filled capacitor is reduced when a dielectric is inserted between the plates is true.