The region of space around a source charge (q) in which it can exert a force on a test charge (q0) .
Mathematically, electric field is the force experienced per unit test charge q0 placed in the electrostatic influence of source charge q .
®E = (®F/q0)
Electric field strength is a vector quantity directed away from a positive charge and towards the negative
charge. SI unit of electric field is newton/coulomb (NC-1) or volt/metre (Vm-1) . The dimensional formula for E is MLT-3 A-1
is the electric field due to a source point charge q at a distance r from it.
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