6Electric FieldDirection: The direction of the force a positive charge would feel.Strength:E=kqr2
7Conducting spheresElectric field is zero everywhere inside the conducting materialAll excess charge is found on the surface of the material.The electric field just outside the conductor s perpendicular to the surface.Charge accumulates at points
8Electric field between two plates Between two plates (except at the edges) the electric field is uniform.
9An airplane is flying through a thundercloud at a height of 2 000 m An airplane is flying through a thundercloud at a height of m. If there are charge concentrations of C at a height of m within the cloud and −40.0 C at a height of 1000 m, what is the electric field at the aircraft? at the aircraft?
10Electric field linesLines begin on positive charges and end on negative.The number of lines leaving a positive charge or ending on a negative is proportional the the magnitude of the charge.No lines can cross eachotherLines are perpendicular to the surface of the conductor
19Out: +Q P -Q The figure above shows two point charges, +Q and –Q. If the negative charge were absent, the electric field at point P due to +Q would have strength E. With –Q in place, what is the strength of the total electric field at P, which lies at the midpoint of the line segment joining the charges?E/4E/2E2E