Question

Two insulating spherical shells are shown below.Shell one, centered at (xy) - (0, 0) and radius R, has a uniform surface charge density of n Shell two, radius 4R and also centered on the origin, has a uniform surface charge density of 7, What is the magnitude of the electric field E at the origin (0,0)? 3R O 0 (nk,th/36) Ο η2/96,

The solid circles in the figure below are two point charges which each have a charge of magnitude q. The dashed circles are cross sections of three Gaussian Surfaces α, β, and γ (α has the largest radius and γ has the smallest radius). Rank the total electric fluxes through the Gaussian Surfaces from most positive to most negative

A very small styrofoam sphere with charge +2C is held 1 mm above the center of a uniformly charged insulating sheet of size 1 m x 1 m. The sphere experiences a repulsive force of 2 N. What is the approximate local charge density at the center of the sheet (to one significant digit)? We cannot say anything since the sheet is a square not a circle. -9x 10-12C/m2. 0 +9 x 10-12C/m. o +4 x 101 C/m. O +2 x 10-11 Cm2.

A negatively charged object O with a charge of -25e is within a cavity inside a conductor C which carries a total positive charge of +20e; the figure is a cross section of the setup. What are the total charges on the cavity wall (surface S1) and the outer surface of the conductor (surface S2)? SI S2 (The first option is S1 and the second option is S2) O 20e, Oe O 0e, 20e O 25e, -5e -25e, 45e O 25e, Oe

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Answer #1

Concept : We use symmetry arguments to solve the first problem. For the second one we use Gauss’s law and for the third we use field due to infinite charge distribution and for the last we again use Gauss’s law for solution.

Eo e。 Co Eb For very dinall dotona yuvw.the theet/ themat Soj 2Co 2N 6 2C1 v durfaan T we 2S E ds - ニ0 at eaciv point in conductor as per Gaussis lau ao Nou, for th cowd ucor

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