The plasma membrane is considered to be polarized because of a charge difference across it. There is an uneven distribution of positive and negative ions across it. The electrical charge difference across it is known as a potential difference. It is said that the cell is more negative from inside than from outside.

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Chapter 11, Problem 11RAC

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The plasma membrane is considered to be polarized because of a charge difference across it. There is an uneven distribution of positive and negative ions across it. The electrical charge difference across it is known as a potential difference. It is said that the cell is more negative from inside than from outside.

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