The positive charge moves along the line of the electric field strength, and the direction of the charge movement coincides with the direction of the strength vector. What is the sign of the work of the field to move the charge? Will the work sign change if the charge sign is changed?
A positive charge is acted upon by a force from the side of the electric field, the direction of which coincides with the direction of the electric field, therefore the work of the field is positive. If you change the sign of the charge, the direction of the force will change, so the work of the field will be negative.
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