[填空题]
A conducting sphere has a radius of 20cm clx tb1/9je-hw0 w3od and a chargtscd0wnae:v)o: ,5 pa e of +3.2μC. Point A is used to describe a location 20cm from the surface of the sph5: 0t: d,eoaav)scwn pere.
1.Calculate the electric potential at the surface of the sphere. State the correct SI unit for your answer. V= $\times10^5\,v$
2.(1)On the axes given, sketch the variation of the electric potential due to the sphere with distance from its surface‾from its surface. Label point A on the graph you have drawn.
(2)Without calculation, outline how the electric field strength at A may be determined using the graph you have drawn
(3)A proton is initially held stationary at the surface of the sphere. The proton is moved from the surface of the sphere to point A. Calculate the work done on the proton. W = $\times10^{-14}\,J$
3.The proton is released from point A. Outline the subsequent motion of the proton.
