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Field Intensity

The force experienced on a positive unit charge placed at a distance of d metres form a charge of Q coulombs is given by

F =       Q            newtons
    4 πor d2

The force experienced on the unit positive charge placed at any point in an electric field is known as electric field strength or field intensity or electric intensity at that point. The field strength or field intensity or electric intensity is represented by E and is measured in newtons per coulomb of charge.

The intensity of electric field at any point may be defined as the force experienced by a unit positive charge when placed at that point.

The electric field strength is a vector quantity having magnitude as well as direction.

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