A solid plastic sphere of radius 10 cm has charge with uniform density throughout its volume. The electric field 5 cm from the center is 86 kN/C radially inward. Find the magnitude of the electric field 15cm from the center.
"E_5=\\frac{kqr_5}{R^3}\\implies q=\\frac{E_5 R^3}{kr_5},"
"E_{15}=\\frac{kq}{r_{15}^2}=\\frac{kE_5R^3}{r_{15}^2kr_5}=\\frac{E_5 R^3}{r_{15}^2r_5}=76~\\frac{kN}{C}."
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