which way do electric-field lines point, from high to low potential or from low to high? Explain please

Electric field lines point from high to low potential. They represent the direction in which a positive test charge would move if placed in the electric field. To understand why electric field lines point in this direction, it's essential to grasp the concept of electric potential.

Electric potential is the amount of electrical potential energy per unit charge at a particular point in an electric field. Electric potential decreases as you move from a point of high potential to a point of low potential.

Since electric field lines are always perpendicular to equipotential surfaces, they must point in the direction of decreasing electric potential. This means that electric field lines move from high to low potential. Therefore, if you place a positive test charge in an electric field, it will naturally move in the direction of the electric field lines – from high to low potential.

To summarize, electric field lines point from high to low potential because they are representative of the direction in which a positive test charge would move in the electric field. This movement occurs as the charge seeks to reduce its potential energy by moving towards regions of lower potential.