Each square centimeter of the surface of an infinite planesheet of paper has 240

Question

Each square centimeter of the surface of an infinite planesheet of paper has 2400000 excess electrons. Find the magnitude ofthe electric field at a point which is 4 cm from the surface of thesheet. Assume that the sheet is large enough to be treated as aninfinite plane.
What is the direction of the electric field at thatpoint? Each square centimeter of the surface of an infinite planesheet of paper has 2400000 excess electrons. Find the magnitude ofthe electric field at a point which is 4 cm from the surface of thesheet. Assume that the sheet is large enough to be treated as aninfinite plane.
What is the direction of the electric field at thatpoint?

Explanation / Answer

The electric field at a point 4 cm from it means nearit surface               E = /20      =(Q/A) /20                                                         = [ (2400000)(1.6*10-19) / 10-4 m2 ] /  /2(8.85*10-12)                               = 2.2*102   N/C which is towardsthe plane because of it negative charge.

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