Work out please

The figure shows four Gaussian surfaces surrounding a distribution of charges. Input the corresponding letter in lower case) +29 (a) Which Gaussian surfaces have an electric flux of +q/co through them? (b) Which Gaussian surfaces have no electric flux through them?A student needs to use Gauss's law to calculate the electric field near a uniformly charged, infinite sheet. She narrows A the possible Gaussian surfaces down to the three shown in the figure. B Which Gaussian surface should the student choose? OA C OB Oc1. (25 pts/5pts each part) The figure shows a spherical shell with uniform volume charge density o = 1.76 nC/m', inner radius a = 15.0 cm, and outer radius b = 2.20a. What is the magnitude of the electric field (in N/C) at the following radial distances? (a) r = a/2.00 Qenc = 0 , so E = 0 (b) r = a Qenc = 0 , so E = 0 (c) r = 1.50a Only some of the total charge of the shell is contained in the Gaussian surface. Qenc = 0*Vsphere =[1.76 *101-9 C/m'] *4/3*pi*[(1.5a^3) - a^3] Area of Gaussian Surface = 4*pi* (1.5a)^2 E = Qenc/(Area of Gaussian Surface x Free Space Permittivity] = 10.5 N/c (d) r=b All of the total charge of the shell is contained in the Gaussian surface. Qenc = 0*Vsphere =[1.76 *101-9 C/m'] *4/3*pi*[(b^3) - a^3] Area of Gaussian Surface = 4*pi* (b)^2 E = Qenc/(Area of Gaussian Surface x Free Space Permittivity] = 19.8 N/c (e) r= 3.00bYou will use Gauss's Law to calculate the electric field inside an insulating sphere of radius R constant charge density p=Quotal/Vital uniformly distributed throughout the sphere. Step 1: Find the charge enclosed by a spherical Gaussian surface of radius r