[填空题]
A non-conducting sphere with radius R carries a uniformly d zcjzt9p ks/:33/w2 uv eqgab/istributed positivdos 9z wad9,m 6 eko)bor-voi.2h)s;fe charge with chfd,-wvezbd oh oa9.ms ) 2;io) 6k9sroarge per unit volume ρ.Point P is at a distance r from the center of the sphere.
The electric field outside this sphere is given by $E_{out}$ = $\frac{ρR^3}{3ϵ_0r^2}$
While the electric field inside the sphere is given by $E_{in}$ = $\frac{ρr}{3ϵ_0}$
Where $ϵ_0$ is the free space permittivity.
The radius of the sphere is 2.0 cm.
1.Calculate ρ when the charge on the sphere is 0.1 μC. ρ = $\times10^−3\,Cm^{−3}$
2.Determine the electric field at point P, when =r=3cm. E = $\times10^5\,NC^{−1}$
3.In the space provided, sketch the variation of electric field E with the distance from the center of the sphere r.
A positive charge is released from the surface of the sphere.
4.Describe the motion of this released charge.
