The electric field as the force on a unit charge. Field lines, the field of a point charge and of a ring or a line of charge, the electric dipole in its own field and in an outside field.
3 lessons, about 2 h 10 min6 simulations11 problems9 practice questionsPython in every lesson
Created by StemPy LabThe electric field at a point is the force on a unit positive charge placed there, , in N/C. A point charge makes a field , away from a positive charge and towards a negative one. Fields of several charges add as vectors. Field lines draw the direction and the strength of a field.
A charge spread over a body is cut into small pieces , each a point charge, and their fields are added. With the densities , and , a ring has on its axis. A straight rod has on its perpendicular bisector, which becomes for a long wire.
An electric dipole is a pair of equal and opposite charges a distance apart, with dipole moment pointing from to . Far away its field is on the axis and on the equatorial line, against . In a uniform field the net force is zero, the torque is and the potential energy is .
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