hey i got some problems in doing this question http://i4.photobucket.com/albums/y117/tkm20022001/AL%20PHY/phy03mc_32_33.jpg" [Broken] the official ans is A i dunno why the 2nd statement is wrong. i think it's right as it;s at equilibrium state if not the charge will accelerate due to e field presents and may affect the charge distribution which is not at a equilibrium moreover i dunno why the 1st statement is true, the - charges should be denser at the inner surface near the + charge, why there is still evenly distrubuted + charges on outer surface denser even when the - charges are denser at some place. i am just studying some basic physics and my mates explain this to me with shielding effect and gauss surface. i don't know about this . Could someone help me solve this question and give me some simple explanation about shielding effect and gauss surface and how they can help me get the answer.