A small sphere of charge q=5 [C] hangs by a thin wire between two parallel infinite plates of charge separated by a distance d= 75 [cm]. The plates are insulating and have charge densities to and-o. At the equilibrium, the sphere is exposed to an electric force of magnitude Felectric = 2.01 x 10-5 [N] Plate-1 Plate-2 1| 21 3 Et +0= 0 d q Which of the plates carries the positive charge density +o? Find the net electric field vector (Ener) between the two plates. [N/C) Find the value of the charge density +o. (C/m²]

A dipole has a positive charge at x = 0.0 nm, y = 7.5 nm and a negative charge at x = 0.0 nm, y = -7.5 nm. The charges are unit charges. Find the electric field strength at x = 1.0 nm, y = 0.0 nm. (The value of k is 9.0 × 10' Nom?/C?.)

Two point charges of 30 nC and -40 nC are held fixed on an x axis, at the origin and at x = 72 cm, respectively. A particle with a charge of 42 μC is released from rest at x = 28 2 cm. If the initial acceleration of the particle has a magnitude of 100 km/s , what is the particle’s mass?