Asquare flat sheet of charge having uniform, charge per unit area. and side length d is aligned with the x-y axis of a cartesian coordinate system such that the center of the sheet is at the origin of the coordinate system. a closed spherical gaussian surface having radius r < d is positioned with its center at the center of the flat sheet. thus, the sheet divides the closed gaussian surface into two open hemispherical surfaces including a first hemispherical open surface that extends toward the positive z direction and a second hemispherical open surface that extends towards the open surface in terms of σ and r.

nec chapter 5 contains

c. information on special occupancy areas

nec chapter 6 covers

a. special equipment

which of the following rules contain the words shall or shall not and must be adhered to?

b. mandatory rules

which of the following rules identify actions that are allowed but not required and typically cover options or alternative methods?

c. optional rules

which of the following serves as the introduction to the nec and provides an overview of the book?

a. nec article 90

organizations that test products for safety are

c. nrtls

the nec is published by the

a national fire protection association

the nec is divided into

b. 9 chapters

the nec provides informative annexes for

c. informational materials and examples

two terms from nec article 100 that trainees should become familiar with are

b. labeled and listed

explanation:

the answer is a. at the equator

e/c, where e is its total energy