Question

A semiconductor wafer with n-type impurities has been stripped from all its free electrons. The wafer is in the form of a flat disk and has positive charges uniformly distributed on its top and bottom surface. The charge density is 10 C/cm^2. Determine the magnitude of the electric flux density D above the wafer in C/m^2.a. 0.5 x10+5 c/m2 b. 0.5x10-5 C/m2 c. 0.5x10 C/m2 d. 10+5 C/m2

Answer 1

Answer:

a. 0.5x10⁵

Explanation:

The charge density = 10C/cm²

We are asked to find the magnitude of the electric flux density

The electric field of infinite sheet

E = σ/2Eo

We have electric density as follows:

D = EEo = EoE

Since charge density σ = 10C/cm²

σ = 10x10²C/m²

D = σ/2

10x10⁴/2

= 5x10⁴C/m²

= 0.5x10⁵C/m²

Therefore the magnitude is equal to 0.5x10⁵C/m². Which gives us option a as the answer