Question 1: (1 point) A charged sphere of mass 1.2 g and charge 13 /C is placed in a uniform electric field. The sphere is released from rest in the field and travels a distance 17 cm in 0.2 seconds. Calculate the strength of the electric field. N/C Question 2: (1 point) It may be surprising, but The Earth carries a negative electric charge of roughly 550 x 10 Coulombs. This charge is maintained by thunderstorms, which deposit negative charge on the earth (worldwide) at the rate of about 10 amperes. If you consider the earth as a sphere, and use the fact that the potential of a charged sphere is the same as that of a point charge at the centre, find the magnitude of the electric potential at the surface of the earth. The radius of the Earth is 6370 km. What is the electric field due to this charge? V/m Question 3: (1 point) You have two conducting plates connected to a battery which keeps the potential difference between the plates at 200 V. The plates are slowly brought together until you hear the loud pop that indicates the resulting field has exceeded the "dielectric strength" of air which is 3,000,000 V/m. The dielectric strength of a material is the largest electric field which can be applied before the electrons in the material become separated from the nuclei (thereby breaking down the material). What is the spacing between the plates? mm