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An isolated conducting sphere of radius a = 0.20 m is at a potential of -2,000 V. (a) Determine the charge Q on the sphere. The charge is then concentrically surrounded by two uncharged conducting hemispheres of inner radius b = 0.40 m and outer radius c = 0.50 m, which are joined together as shown above, forming a spherical capacitor. dielec sphere in field E: This is the electric field of a dielectric sphere in a uniform external field. The size of the sphere and the dielectric strength are adjustable. A dielectric is an insulating material whose atoms are polarized in response to an external field; this causes the field to be weaker inside the dielectric. dielec sphere in ... The magnitude of the potential depends on the Q of the source charge producing the electric field, the distance d from the source charge, and the configuration. For example, the electric potential at any given point around a point charge or a uniformly charged positive sphere with charge Q is given by this formula. Example 2: A 32-nC point charge is at the center of a sphere 80.0cm in diameter. Calculate (a) the magnitude of the electric field at any point on its surface, (b) the angle that the electric field at a point on the surface makes with normal to the surface at that point, and (c) the electric flux that passes through the entire surface of the sphere.