An infinitely long sheet of charge of width L lies in the ry-plane between z = --L/2 and z = L/2. The surface charge density is n. Derive an expression for the electric field E at height z above the centerline of the sheet. Express your answer in terms of some or all of the variables e0, T, 7, L, z, and unit vector k. Use the 'unit vector' button to denote unit vectors in your answer. ? E =

A -1.11 nC point charge is located inside a cavity of a hollow sphere of conducting material with charge 6.72 nC and of radius 10.0 cm.  Calculate the electric field 0.473 m from the point charge in units of N/C.  Assume answers are in the radial direciton such that if the field points radially away your answer will be positive and if the field points radially in your answer will be negative.  Give your numerical result to 3 significant figures and type in the units after your numerical answer.

show details

A uniformly charged disk of radius R=25 cm carries a total charge of Q=2 μC. R P 1 Find the magnitude of the electric field E created by the disk at the point P located at distance 40 cm from the center of the disk. E = [N/C] 2. What is the direction of the electric field E created by the disk at point P. Direction: 3. Write the expression of the electric filed E created by the disk at point P. Ē =< [N/C] 4. Find the magnitude of the electric field E created by the disk at the point P located at distance 8 m from the