Consider a test charge is moving in and electric field of a parallel plate capacitor then : Force F = ma In an electric field, F = qE For an electron in field E, qE = ma => a = qE/m As the charge is in uniform electric field "E" will be constant . As "E" is the force per unit charge so "qE" will be constant and mass is always constant. Therefore, acceleration is constant??????? I'm very confused in it. what does an uniform electric field actually means. is the uniform e.field of a single charge same as the electric .field of a parallel plate capacitor?