In the general world view of magnetism, magnetic fields arise from : stationary color charges
moving magnetic monopoles
moving electric charges, or currents
rest mass

The correct option is "moving electric charges or currents".

Explanation:

Magnetic field is used to  define as a field that surrounds a current carrying conductor or moving electric charge by virtue of which it exerts a force on another current carrying conductor or a moving charge itself.

The magnetic field generated by a moving charge is given by

where

q = is the magnitude of charge

v = is the velocity vector of the moving charge

r = is the position vector of the point at which the field is calculated

|r| = is the magnitude of position vector.

Similar the magnetic field generated by a current carrying conductor is given by

where

I is the current

The integration is carried out along the whole length of conductor.

Also since magnetic mono poles do not exist or their existence is not confirmed until now so it is not an appropriate option.

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:

answer: strength i guess

explanation: