2.| Three very large planes of charge are arranged as shown (on edge) below with area charge densities of o1 = +45.0 µC/m², o2 = -15.0 µC/m², and o3 = +25.0 µC/m². Find the magnitude and the direction of the electric field at the points A, B, C, and D below. (Hint: Can we use the parallel-plate capacitor result? Why or why not?) o 02 D

5. This problem concerns a junction with a heavily doped n-type region, a thin intrinsic layer, and a moderately doped p-type region as sketched below. Assume the depletion approximation and assume that the width of the depletion region on the P-side is significantly greater than the thickness of the intrinsic layer. N₁-N₁ No=10¹8 D Intrinsic layer N₁ = 10¹⁹ (a) Sketch the electric field vs. position assuming the depletion approximation. (b) Using the sketch in (a), develop an expression for the depletion layer width in the pregion. Your answer should be in terms of Vbi and NĄ. (c) Compare this structure to the same structure without the intrinsic layer. Explain what effect the intrinsic layer will have on the built-in potential, Vbi. (d) Compare this structure to the same structure without the intrinsic layer. Explain what effect the intrinsic layer will have on the maximum electric field in the junction.

Difficult problem that I need some help on please

Two positive point charges q1=4.40 uC and q2=6.40 uC are separated in vaccum in distacne of 6.0m find the magnitude of the net electric at point r!=4.80m from q1 in N/C