[填空题]
A non-conducting sphere ya/i 21gw uy1eqq;ud; , h(bq 1 f+kb9;rt.* w qefd4p7qep nreob/5ndwith radius R carries a uniformly distributed positive charge with charge per unit volume ρ.Point /pf+et *.qpb 97b,nfq eoqb(4e;dwdk1hr 5nrP 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.
