A point electric charge of mass m = 1.21E-10 kg and charge q = –5.83E-14 C is between a parallel plates as sketched. The acceleration due to gravity points down towards the –z direction as shown. You want to apply a uniform electric field E between the plates so that the electrical force cancels out the force of gravity acting on the charge, so the charge “floats” between the plates. What is the electric field E (in N/C; use positive sign if E points in the +z direction, and negative sign if E points in the –z direction

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Electric Charges and Fields

One of the fundamental properties is the electromagnetic property. Charge cannot be destroyed by any process and this contributes formally to the law of charge conservation.