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.
E5=kqr5R3 ⟹ q=E5R3kr5,E_5=\frac{kqr_5}{R^3}\implies q=\frac{E_5 R^3}{kr_5},E5=R3kqr5⟹q=kr5E5R3,
E15=kqr152=kE5R3r152kr5=E5R3r152r5=76 kNC.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}.E15=r152kq=r152kr5kE5R3=r152r5E5R3=76 CkN.
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