how the field lines represent the electric field for isolated positive and negative charges?
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Because positive charges repel each other, the electric field around an isolated positive charge is oriented radially outward. When they are represented by lines of force, or field lines, electric fields are depicted as starting on positive charges and terminating on negative charges.
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If the point charge is positive, field lines point away from it; if the charge is negative, field lines point toward it.
The electric field around an isolated negative charge is radially inwards (spherical symmetry). The electric field around a positive charge and an equal but negative charge.
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