A concentric hollow insulating spherical shell with inner radius r1=1.59R and outer radius r2=3.88R has a point charge Q1=-10.43Q at the center. If the insulating shell has a uniform volume charge density p =9.25(Q/R'), find the electric field at a point midway between inner and outer surface of the insulating sphere, Er= 1+2 -) interms of 2 and radial unit vector. (Express your answer in 2 decimal places). 4 TTEOR?
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