5. A small insulating sphere has a charge of -30.0 uC and mass of 2.00 g. It is suspended from a 10.0-cm long (neutral) insulating string in a uniform electric field. The string hangs at an angle of 23.0 to the vertical and has a tension of 0.100 N. (a) Sketch the physical setup and define an appropriate coordinate system. (b) Determine the magnitude and direction of the electric field. 6. A beam of electrons of kinetic energy K is fired into a region of uniform electric field. (a) In order to stop the electrons in a distance d, what must the component of the field be in the direction of motion? (b) How would the answer differ for protons of the same kinetic energy