Please answer to all questions not only for one.

Part A An electron close to a large, flat sheet of charge is repelled from the sheet with a 1.4 pN force. Find the surface charge density on the sheet. Express your answer using two significant figures. AEd O ? Xb Vx VX X X IXI X . 10n X O = 1.5 . 10 -4 C/m2 Submit Previous Answers Request Answer X Incorrect; Try Again; 5 attempts remaining Check your signs.Part A Two small insulating spheres with radius 5.00*10" In are separated by a large center-to- center distance of 0.515 III . One sphere is negatively charged, with net charge -2.05 /C. and the other sphere is positively charged, with net charge 3.05 /C . The charge is uniformly What is the magnitude A of the electric field midway between the spheres? distributed within the volume of each sphere. Take the permittivity of free space to be ep = 8.85x10-12 C-/(N . m?) - *View Available Hint(s) OF ? E = N/C Submit Part B What is the direction of the electric field midway between the spheres? O toward the positively charged sphere O toward the negatively charged sphere O upward perpendicular to the line connecting the centers of the spheres O downward perpendicular to the line connecting the centers of the spheres