An electric field describes a region where an electric charge will experience a force if placed in that region. The electric field can be represented by field lines. These lines start on a positive charge and end on a negative charge. The direction of the field lines show the direction of the electrostatic force that would act on a positive charge, q, if you placed it there.

Electric field lines never cross and are drawn perpendicular to a surface. The electric field is stronger where the field lines are closer together.

The Electric Field is defined as the force acting on a positive test charge (q), divided by the charge: E E F F Electric field of a point charge +Q r

A proton is released in a uniform electric field, and it experiences an electric force of 3.75 × 10-14 N toward the south. What are the magnitude and direction of the electric field? E + south F

An electric field is defined as being present in any region where a charged object experiences an electric force. 

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4) E-fields add as vectors Notes on E-field 1) The E-field points in the direction of force on a positive test charge 2) If a negative charge were placed in the E-field, what do you suppose would happen? 3) The E-field is a property of the fixed charges only (it is independent of the test charge) 4) E-fields add as vectors 5) Given the E-field value at a certain point, we can calculate the force F on any charge q0 placed there: F = q0E © Laura Fellman

What are the magnitude and direction of the electric field at a point midway between a +7.0 mC and a -8.0 mC charge 8.0 cm apart? Assume no other charges are nearby. + - d q1 q2 E1 E2

Four charges are placed in a square. There is a - 20 Four charges are placed in a square. There is a - 20.3 micro-coulomb charge placed at the (0 cm, 0 cm) mark, a 81.2 micro- coulomb charge placed at the (0 cm, 40.6 cm) mark, a - 20.3 micro-coulomb charged placed at the ( 40.6 cm, 40.6 cm) mark, and a 10.15 micro-coulomb charge placed at the ( 40.6, 0cm) mark. Determine the strength of the electric field in the center of the square.