Electric Field Intensity Definition — the NEET Physics formula with its derivation, variables, validity constraints and worked solver.
Electric Field Intensity Definition Valid for calculating the electric field strength at a point given the force on a known test charge, or vice versa. Assume a source charge creates an electric field. Place a small positive test charge q in the field. Measure the electrostatic force F acting on q. Define Electric Field E as the ratio F/q. The test charge q must not be zero. The test charge q is assumed to be small enough not to disturb the source charge distribution. Believing that the Electric Field E depends on the magnitude of the test charge q (E is a property of the location/source, not the test charge). Confusing Electric Field (N/C) with Electric Force (N). Thinking E is zero if no test charge is present.