Why would writting a summary of a text you understand a text more fully than just reading it?

Writing a summary of a text would be the best possible way to understand a text more clearly.

Explanation:

A summary is what you remember from the excerpt you have just finished reading so a summary is what you recall happening in the passage it helps you accumulate your thoughts about the passage making it easier to understand and remember what you have read.

the direction of the magnetic field produced by an electric current will change when the direction of the electric current changes. for example : if a current is flowing in a straight length of wire, the magnetic field is described by a concentric circle (using right-hand rule).