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Murljashka [212]
3 years ago
5

What is the difference between the B-field and the H-field?

Physics
1 answer:
Simora [160]3 years ago
3 0
The H field is in units of amps/meter.  It is sometimes called the auxiliary field. It describes the strength (or intensity) of a magnetic field. The B field is the magnetic flux density.  It tells us how dense the field is.  If you think about a magnetic field as a collection of magnetic field lines, the B field tells us how closely they are spaced together. These lines (flux linkages) are measured in a unit called a Weber (Wb).  This is the analog to the electric charge, the Coulomb.  Just like electric flux density (the D field, given by D=εE) is Coulombs/m²,  The B field is given by Wb/m², or Tesla.  The B field is defined to be μH, in a similar way the D field is defined.  Thus B is material dependent.  If you expose a piece of iron (large μ) to an H field, the magnetic moments (atoms) inside will align in the field and amplify it.  This is why we use iron cores in electromagnets and transformers.
So if you need to measure how much flux goes through a loop, you need the flux density times the area of the loop Φ=BA.  The units work out like 
Φ=[Wb/m²][m²]=[Wb], which is really just the amount of flux.  The H field alone can't tell you this because without μ, we don't know the "number of field" lines that were caused in the material (even in vacuum) by that H field.  And the flux cares about the number of lines, not the field intensity.
I'm way into magnetic fields, my PhD research is in this area so I could go on forever.   I have included a picture that also shows M, the magnetization of a material along with H and B.  M is like the polarization vector, P, of dielectric materials. If you need more info let me know but I'll leave you alone for now!

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OLga [1]

Answer: Option (d) is correct.

Explanation:

Given,  1,152 British thermal units

1 British thermal unit = 1055.06 joules

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If this decay has a half-life of 10.2 years, what mass of 60.8g carbon-14 will remain after 20.4 years
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What is the formula for momentum? *<br><br> p = m/v<br> f = m x a<br> f = m/s<br> p = m x v
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momentum in a body can be calculated using

<em><u>Mome</u></em><em><u>ntum</u></em><em><u>=</u></em><em><u>Mass×</u></em><em><u>V</u></em><em><u>e</u></em><em><u>l</u></em><em><u>o</u></em><em><u>s</u></em><em><u>i</u></em><em><u>t</u></em><em><u>y</u></em><em><u> </u></em>

<em><u>i</u></em><em><u>e(</u></em><em><u>p</u></em><em><u>=</u></em><em><u>m×</u></em><em><u>v</u></em><em><u>)</u></em>

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E Describe the meaning of a line crossing the x-axis in a<br> velocity-time graph.
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A line crossing the x-axis in a velocity-time graph means that the moving object has changed its direction.

Explanation:

Velocity-Time graph:

A velocity-time graph is a two dimensional graph with velocity at its y-axis and time at its x-axis. At any point, value of y represents the velocity and value of x represents the time. The slope of the graph gives us the acceleration or deceleration of the moving object.

In a velocity-time graph:

- A straight line represents constant velocity.

- A diagonal line means that the velocity of a body is changing.

*Referring to the figure attached with the answer*

The velocity of the moving object increases at a constant rate for the first 10 minutes. Then the velocity is 60 m/min for the next 5 minutes. After that the velocity is decreasing. Till 30th minute when the velocity is at 0 m/min.

What happens here?

Velocity is a vector quantity. It has some direction. In a velocity-time graph, we are only concerned with two directions of velocity:

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8 0
2 years ago
Natasha weighs 530N. what is her kinetic energy as she swimsat
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<u>Answer:</u> The kinetic energy of Natasha as she swim is 38.88 J

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Force is defined as the mass multiplied by the acceleration of the object.

Mathematically,

F=m\times a

where,

F = weight of Natasha = 530 N

m = mass of Natasha = ?

a = acceleration due to gravity = 9.8m/s^2

Putting values in above equation, we get:

530kg.m/s^2=m\times 9.8m/s^2\\\\m=\frac{530}{9.8}=54kg

Speed is defined as the rate at which an object moves with respect to time.  To calculate the speed, we use the equation:

s=\frac{d}{t}

where,

d = distance traveled = 72 m

t = time taken by Natasha = 1.0 min = 60 sec   (Conversion factor:  1 min = 60 s)

Putting values in above equation, we get:

s=\frac{72}{60}=1.2m/s

Kinetic energy is defined as the energy which is possessed due to its motion.  It is also defined as the half of the product of mass of the object and square of the velocity of the object.

Mathematically,

E_K=\frac{1}{2}mv^2

where,

E_K = kinetic energy of Natasha

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Putting values in above equation, we get:

E_K=\frac{1}{2}\times 54\times (1.2)^2\\\\E_K=38.88J

Hence, the kinetic energy of Natasha as she swim is 38.88 J

3 0
3 years ago
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