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3 years ago

The strength of a magnetic field follows _____.

Physics

2 answers:

ycow [4]3 years ago

8 0

I think its Coulomb's law<span>
</span>

Orlov [11]3 years ago

5 0

Answer: The correct answer is "law of poles".

Explanation:

Magnetic field lines: These are the area around the magnet in which the magnetic force can be experienced. The strength of the magnetic field is stronger at the poles of the magnet. It decreases from the poles.

The direction of the magnetic field lines is from north pole to south pole.

Law of poles: The same poles of the magnets repel each other with magnetic force of repulsion between the poles.

The opposite poles of the magnets attract each other with the magnetic force of attraction between the poles.

The strength of the magnetic field does not follow an inverse square law. The force from the magnet decreases faster than an inverse square law because all magnets have two opposite poles and single pole does not exist.

Therefore, The strength of a magnetic field follows law of poles.

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A 5000 kg open train car is rolling on frictionless rails at 22 m/s when it starts pouring rain. A few minutes later, the car’s

Phantasy [73]

Answer:

500 kg

Explanation:

It is given that,

The mass of a open train car, M = 5000 kg

Speed of open train car, V = 22 m/s

A few minutes later, the car’s speed is 20 m/s

We need to find the mass of water collected in the car. It is based on the conservation of momentum as follows :

initial momentum = final momentum

Let m is final mass

MV=mv

$m=\dfrac{MV}{v}\\\\m=\dfrac{5000\times 22}{20}\\\\=5500\ kg$

Water collected = After mass of train - before mass of train

= 5500 - 5000

= 500 kg

So, 500 kg of water has collected in the car.

3 0

3 years ago

How does the structure of the stigma aid in pollination

natali 33 [55]

<span>Pollination is the process by which pollen is transferred to the female part of a plant. The stigma is the central part of the flower, that is supported by a style and is part of the female reproductive organ within plants. Its structure is optimised to promote pollination by having hairs, sticky surfaces and three-dimensional sculptures that capture and trap pollen.</span>

5 0

3 years ago

When changing a tire sized 195/75 R15 to a 5 percent lower profile, the correct tire size would be _____

valentinak56 [21]

Answer and explanation:

When you are changing a car tire, the most important thing is to keep the total diameter as equal as possible.

The total car tire diameter can be calculated as:

$D_{tot orig}=\frac{195 \cdot 75}{2540 \cdot 2}+15''=26.5''$

The profile of this tire is 75 (the higher/taller relation), therefore a 5 percent lower profile would be:

pr=0.95·75=71.25

The problem is that the profiles are normalized and the nearest profile available is 70.

If we take a theorical tire with a profile of 71.25:

$D_{tot orig}=D_{new}\\\frac{195 \cdot 75}{2540 \cdot 2}+15''=\frac{X \cdot 71.25}{2540 \cdot 2}+15''\\X=205.26$

The theorical tire size should be 205/71 R15.

If we look for a real tire size, we should look for a tire with a diameter nearest to 26.5'' and a profile of 70.

The best option for real tire size is: Tire 225/70 R14 (wheel diameter of 26.4'') or 205/70 R15 (wheel diameter of 26.3'').

3 0

3 years ago

Can i have the physical science grade 12 june 2021 paper (common paper)

Veseljchak [2.6K]

Answer:

u have to purchase it via online e-commerce platforms

7 0

2 years ago

Read 2 more answers

If 175 kJ of heat caused a chunk of ice at 0°C to melt to liquid water at 0°C, how many moles were in the ice? How many grams of

elena55 [62]

Answer is 29.1 mol or 525 g

Explanation:

8 0

2 years ago