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Dominik [7]
2 years ago
15

In Class I, Division 1 locations, transformers, impedance coils, and resistors, along with any switching mechanism associated wi

th them, shall be provided with enclosures identified for _____.
Physics
1 answer:
ycow [4]2 years ago
4 0

According to 501.105 (A) of the National Electrical Code (NEC), enclosures identified for <u>Class I, Division 1 locations</u> should be provided in Class I, Division 1 locations, transformers, etc.

<h3>What is the National Electrical Code (NEC)?</h3>

The National Electrical Code (NEC) can be defined as a regional standard that is adopted by various municipalities, cities and state, in order to ensure the safe installation of electrical wiring, machineries (equipment), transformers, impedance coils, and resistors in the United States of America.

Basically, the main purpose of the National Electrical Code (NEC) is to enable safe and effective electrical practices and installations in the United States of America.

According to 501.105 (A) of the National Electrical Code (NEC), the following location and equipment should be provided with enclosures identified for <u>Class I, Division 1 locations</u>:

  • Class I equipment
  • Division 1 locations
  • Control transformers
  • Impedance coils
  • Resistors
  • The switching mechanism

Read more on National Electrical Code here: brainly.com/question/10619436

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Explanation :

Magnetic field, B = 5.2 T

Electric field, E=4.6\times 10^4\ N/C

The directions of the two fields are perpendicular to each other. Hence the force due to each field will equate each other.

Electrostatic force, F =qE.........(1)

Magnetic force, F = qvB........(2)

From equation (1) and (2)

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v=\dfrac{E}{B}

v=\dfrac{4.6\times 10^4\ N/C}{5.2\ T}

v=0.88\times 10^4\ m/s

v=8.8\times 10^3\ m/s

Hence, the correct option is (a).

(2) A permanent magnet always has two poles as the North pole and south pole. The magnetic field lines start from north poles and terminate at the south pole of the magnet.

Hence, the correct option is (C).

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Which of the following mechanical waves has the most energy <br> A<br> B<br> C<br> D
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Work done is equal to 125.44 J

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Acceleration due to gravity g=9.8m/sec^2

Coefficient of kinetic friction \mu =0.4

So normal force exerted by student F=\mu mg=0.4\times 80\times 9.8=313.6N

We know that work done is equal to multiplication of force and distance

So work done W=Fd=313.6\times 0.4=125.44J

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3 years ago
In Europe the standard voltage in homes is 220 V instead of the 120 V used in the United States. Therefore "100-W" European bulb
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Explanation:

In Europe the standard voltage in homes is 220 V instead of the 120 V used in the United States.

100-W European bulb would be intended for use with a 220-V potential difference.

(a) If V = 220 V and P = 100 W

Power :

P=\dfrac{V^2}{R}\\\\R=\dfrac{V^2}{P}\\\\R=\dfrac{(220)^2}{100}\\\\R=484\ \Omega

If you bring a "100-W" European bulb home to the untied States, what should be its US power rating. So,

P=\dfrac{V^2}{R}\\\\P=\dfrac{(120)^2}{484}\\\\P=29.75\ W

or

P = 29.8 watts

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The length of a certain wire is doubled and at the same time its radius is also doubled. What is the new resistance of this wire
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Answer:

R' = R/2

Therefore, the new resistance of the wire is twice the value of the initial resistance.

Explanation:

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Then:

R = ρL/A

R = ρL/πr²   --------------- equation 1

Now, the new wire has:

Resistance = R'

Resistivity = ρ

Length = L' = 2 L

Radius = r' = 2r

Area = πr'² = π(2r)² = 4πr²

Therefore,

R' = ρL'/πr'²

R' = ρ(2 L)/4πr²

R' = (1/2)(ρL/πr²)

using equation 1:

<u>R' = R/2</u>

<u>Therefore, the new resistance of the wire is twice the value of the initial resistance.</u>

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