Answer Happy

11. A charge of -2.70 UC is fixed in place. From a horizontal distance of 0.0495 m, a particle of mass 7.85 x 10 kg and charge -7.75 C is fired with an initial speed of 68.0 m/s directly toward the fixed charge. How far does the particle travel before its speed is zero? m 12. An equipotential surface that surrounds a point charge q has a potential of 455 V and an area of 1.12 m2. Determine q. с 13. The inner and outer surfaces of a cell membrane carry a negative and a positive charge, respectively. Because of these charges, a potential difference of about 0.078 V exists across the membrane. The thickness of the cell membrane is 7.50 x 10°m. What is the magnitude of the electric field in the membrane? V/m 14. A spark plug in an automobile engine consists of two metal conductors that are separated by a distance of 0.85 mm. When an electric spark jumps between them, the magnitude of the electric field is 5.75 x 10 V/m. What is the magnitude of the potential difference AV between the conductors?