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Electric Field – Notes and Examples An electric field is an area of influence around a charged object It is given as the amount of electrical force exerted on a positive test charge placed at a given point in the field Electric field = electric force test charge E = F Q2 For the electric field around a point charge (or spherical charge distribution) E = F = k Q1 Q2 1 Q2 d122 Q2 = k Q1 d122 Mr. Fawcett is photocopying lab sheets for his first period class. A particle of toner carrying a charge of 4.0 x 10-9 C in the copying machine experiences an electric field of 1.2 x 106 N/C as it’s pulled towards the paper. What is the electric force acting on the toner particle? a) Determine the electric field strength at the position of an electron 10 -10 m away from the proton in a hydrogen atom. b) What is the force on the electron at this position? Gordon the night custodian dusts off a classroom globe with a feather duster, causing the globe to acquire a charge of –8.0 x 10-9 C. What is the magnitude and direction of the electric field at a point 0.40 m from the center of the charged globe? As Courtney watches TV, the electron beam is steered across the screen by the field between two charged plates. If the electron experiences a force of 3.0 x 10 -6 N, how large is the field between the deflection plates? A fly accumulates 3.0 x 10-10 C of positive charge as it flies through the air. What is the magnitude and direction of the electric field at a location 2.0 cm away from the fly?