A large thin plane sheet of plastic is charged on one side with a surface charge

Question

A large thin plane sheet of plastic is charged on one side with a surface charge density of 5 nC/m2. What is the magnitude of the electric field 1 cm above the center of the sheet (1 nC = 1 x 10-9 C)?

1130 N/C

2260 N/C  

565 N/C

141 N/C

282 N/C

A plane sheet of aluminum is isolated and charged to a density of (C/m2) on each face, as shown. What is the electric field near the center of the sheet and outside but near the surface (point A)?

zero

tangent to the sheet and of magnitude /20

tangent to the sheet and of magnitude /0

perpendicular to the sheet and of magnitude /0

perpendicular to the sheet and of magnitude /20

Explanation / Answer

Solution:

A)

d = 1 cm is close enough for a large sheet hence we'll use  /(2*) for Electric field calculations.

As we know;

E = /(2*)

=> E = (5.0e-9)/(2*(8.854e-12))

=> E = 282.3582 N/C

B)

E = perpendicular to the sheet and of magnitude /0

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