.__ _ _._7.-..'.-- _-....-- -uw- leUutlUl-h w nuuu opusuLaLuml .JJ pumle ' Positive charge' 18 placed on two conducting sphe1es that are very far

I don't understand how to solve #2 and #3 on the attached problem set. The answers are shown, I just need help understanding how they arrived at these answers. I understand how to solve #1 so please ignore that question.

.__ _ _._7.-..‘.-- _-....-- -uw- leUutlUl-h w nuuu opusuLa—Luml .JJ pumle ‘ Positive charge' 18 placed on two conducting sphe1es that are very far apart and connected by a 5"“, long, very thin conducting wire. The radius of the larger sphe1e 1s 12. 0 cm and the radius of the smalle1 sphere 15 5.0 cm. The electiic field strength at the smface of the la1ge1 ephem' 134001ch. 1. What is the surface charge density of the larger sphere? . 'L! 00 3, E g; . G- AA. 2.23 tthlnz - W1 7—m3.541.1011'112 W1 (‘ '2‘ .)C. 4.32 11me ' _. toD. 6.47 1.1.0.1311: . j Q : 61: lo 0E. 8.49 cm2“ 5 e 2. What IS the potential at the surface of the smaller sphere? (Assume the potential' 13 zeta atinfinity ) A. zokv .B 32w . {7’60 EV/m' 9' 12m . Qflrzy3, What is the surface charge density of the smaller sphere? jA. 2.23110me ' . .13. 3.54 1.1011112 _ . . V " .__.©0. 4.32 pC/mz -_ 2 i"D. 6.47 pCIm@ 3.49 helm”V = k’, 4 1W 6’5 t Vkan