An object with a net charge of 21 µC is placed in a uniform electric field of 590 N/C, directed vertically. What is the mass of the object if it "floats" in the electric field?
Find the electric field at the folowing radii from the center of this charge configuration.
A charge of 7.00 10-9 C and a charge of -4.50 10-9 C are separated by a distance of 60.0 cm. Find the position at which a third charge, of 13.0 10-9 C, can be placed so that the net electrostatic force on it is zero.