2. A charged particle is placed at the center of an evacuated, metal, spherical shell. A cross-sectional view is shown below. The particle's radius ro is small compared to a and b. Thecharge of the particle is initially unknown. The shell is insulated from its surroundings.Independent of the charged particle, the metal shell is given a total charge of +12 nC. Theelectric field at a radius r > b is E = 135 (-+)2a. Determine the charge of the particle.G.b. Determine an equation for the electric field for ŉ

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