Athin, horizontal, 18-cm-diameter copper plate is charged to -3.8 nc. assume that the electrons are uniformly distributed on the surface. part a) what is the strength of the electric field 0.1 mm above the center of the top surface of the plate? express your answer to two significant figures and include the appropriate units. part b) what is the strength of the electric field 0.1 mm below the center of the bottom surface of the plate? express your answer to two significant figures and include the appropriate units.

Part a)

Part b)

Explanation:

Part a)

Electric field due to large sheet is given as

now the electric field is given as

Part b)

Now since the electric field is required at same distance on other side

so the field will remain same on other side of the plate

the total distance that martina travels that day is

(distance from home to mom's office) plus (distance from mom's office to school)

plus (distance from school to library) plus (distance from library to friend's house)

plus (distance from friend's house to martina's house).

(we don't know what any of these distance actually is.)