A spherical shell of radius 9.0 cm carries a uniform surface charge density $\sigma$ = 9.0 nC/m².The electric field at r = 4.0 cm is approximately A)0.13 kN/C B)1.0 kN/C C)0.32 kN/C D)0.75 kN/C E)zero

Question

Quizplus · Accepted Answer

For a spherical shell with uniform surface charge density, the electric field inside the shell (r < radius of the shell) is zero due to the symmetry of the problem and Gauss's law. Since 4.0 cm is inside the shell of radius 9.0 cm, the electric field at that point is zero.

A Spherical Shell of Radius 9 σ\sigmaσ = 90 NC/m2

A Spherical Shell of Radius 9 $\sigma$ = 90 NC/m²