why direction of electric field lines always from positive to negative?

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We know same charge repels while opposite charge attracts by each other.electric field lines or electric lines of force is a imaginary force which connect the two opposite charges.if we place a unity positive text charge and a negative charge they are attracted by each other due to electric lines of force.
why direction of electric field lines always from positive to negative?
direction of electric lines of force may be positive to negative or negative to positive .but for our easier calculation we generally consider electric lines of force from positive to negative (which is the standard statement).

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