Recent content by willdefender

8.We can calculate the previous field with E1=Q/(4*Π*ε0*r*r), after collasping, we should calculate it with E2=δ/(2*ε0）=E1/2, isn't it? 12. I think the charge on the outer surface is Q-q, while the one on the inner surface is q-Q.

Thanks for your replying! 6.If something that has a negative mass, it can be considered as a source. 8.So if the charge are in the ball(not distributed on the ball), the charge will not changed.But does not the electric field determined only by the charge? Does the distribution of charge...

QUESTIONS 5.The electric field E is zero at all points on a closed surface; is there necessarily no net charge within the surface? If a surface encloses zero net charge, is the electric field necessarily zero at all points on the surface? 6.Define gravitational flux in analogy to electric...

Thank you for your suggestions! This is my first time discussing questions here. I hope the ones below will satisfy the requires here!

1.If you charge a pocket comb by rubbing it with a silk scarf, how can you determine if the comb is positively or negatively charged? ----Our teacher suggest to use the electroscope which has some charged on the leaves originally.And then put the comb near the metal of the electroscope but not...

1.If you charge a pocket comb by rubbing it with a silk scarf, how can you determine if the comb is positively or negatively charged? 6.Contrast the net charge on a conductor to the "free charges" in the conductor. 7.A charged rod placed near an unchanged metal object can attract(or repel)...