In forward biasing of the p-n junction

Question

the positive terminal of the battery is connected to p-side and the depletion region becomes thick.

the positive terminal of the battery is connected to n-side and the depletion region becomes thin.

the positive terminal of the battery is connected to n-side and the depletion region becomes thick.

the positive terminal of the battery is connected to p-side and the depletion region becomes thin.

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