Why are the plates in a capacitor parallel to each other? to allow each plate to become positively charged to form a uniform electric field between the plates to establish a potential difference between the plates to allow each plate to hold the same amount of charge

To form a uniform electric field between the plates. It's not establishing differences by being parallel. If they was both positively charged nothing would be formed without some negative charge so you can eliminate that and the last one so the answer is to form a electric field they both must be parallel.

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