A disk with a uniform positive surface charge density lies in the x-y plane, centered on the origin.Along the positive z axis, the direction of the electric field is:
A)in the +z direction
B)in the -z direction
C)in the +x direction
D)in the +y direction
E)there is no field along the positive z axis

Question

Quizplus · Accepted Answer

According to Gauss's law, the electric field due to a uniformly charged disk along its normal axis is given by E = σ/(2ε₀), where σ is the surface charge density and ε₀ is the permittivity of free space. Since the disk has a positive surface charge density, the electric field points away from the disk along the positive z axis, i.e., in the +z direction.

A Disk with a Uniform Positive Surface Charge Density Lies