(a) In tin at room temperature, the mobility of mobile electrons is about 1.5 ✕ 10-3 (m/s)/(V/m), and there are about 3.7 ✕ 1028 mobile electrons per m3. Calculate the conductivity σ. In actual practice, it is usually easier to measure the conductivity σ and deduce the mobility u from this measurement.

The value is

Explanation:

From the question we are told that

   The mobility of electron in a tiny room is  

  The number of mobile electron per is  

  Generally the conductivity is mathematically represented as

Here   is the charge on a single electron and that value is  

So

=>      

=>    

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: