Two spherical shells with radii Ra=9.0 [m] and Rb=7.7 [m], are at powers Va=-86 [V] and Vb=-56.5 [V], find the density of charge in [nC/m2] on the conductive surface of Ra=9.0. If the relative permittivity of the medium is 1.2.​​​​​​

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Electric field

A physical field present around an electrically charged particle that exerts a force on all other charged particles is called an electric field. The charged particles present in the field either repel or attract. From electric charges or time-varying magnetic fields, the electric field originates. One of the manifestations of electromagnetic force which is one of the four fundamental forces present in nature are the electric fields and magnetic fields.