Use the following figure to answer the next problem:
-A disk of radius 10 cm has a uniform charge density of 20 nC/cm².The electric potential at a distance x = 20 cm on its axis is

Question

Use the following figure to answer the next problem:

-A disk of radius 10 cm has a uniform charge density of 20 nC/cm².The electric potential at a distance x = 20 cm on its axis is

Quizplus · Accepted Answer

The electric potential at a distance x on the axis of a disk of radius R and surface charge density σ is given by:
V = 2πkσR²(1/√(R²+x²))
where k is the Coulomb constant. 
Substituting the values given, we get:
V = (2π)(9×10^9)(20×10^-9)(10×10^-2)²(1/√(10×10^-2)²+(20×10^-2)²))
V ≈ 267 kV

Use the Following Figure to Answer the Next Problem