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3 years ago

Which statement about electromagnet is true

Physics

2 answers:

Snowcat [4.5K]3 years ago

7 0

Answer: It doesn’t function without a source of current

Explanation:

In an electromagnet, the magnetic field is generated by an electric current in a coil of wire which reinforces an iron core. But when the electric current applied on the mentioned core is disconnected, it immediately loses its magnetization. This also means that the intensity of the magnetic field can be controlled (increased or decreased) by changing the intensity of the electric current flowing through the nucleus.

That is why an electromagnet does not work without electric current.

avanturin [10]3 years ago

3 0

Answer:

<h2>It doesn’t function without a source of current.</h2>

Explanation:

An electromagnet is defined as a magnet where its magnetic field is generated by an electrical current.

A simple form of an electromagnet is coil of wire wrapped around an iron core. The iron material helps to intensity the magnetic field.

Additonally, the strength of the magnetic field depends directly on the amount of current.

Therefore, the right answer is the first choice, because an electromagnet won't work without a current.

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Which would require the greater energy; slowing down of the orbital speed of the Earth so it crashes into the sun, or speeding u

tresset_1 [31]

Answer: Speeding up the orbital speed of earth so it escapes the sun require the greater energy.

Explanation: To find the answer, we need to know more about the Orbital and escape velocities.

<h3>What is Orbital and Escape velocity?</h3>

Orbital velocity can be defined as the minimum velocity required to put the satellite in its orbit around the earth.
The expression for orbital velocity near to the surface of earth will be,

$V_o=\sqrt{gR}$

Escape velocity can be defined as the minimum velocity with which a body must be projected from the surface of earth, so that it escapes from the gravitational field of earth.
The expression for orbital velocity will be,

$V_e=\sqrt{2gR}$

If we want to get into the sun, we want to slow down almost completely, so that your speed relative to the sun became almost zero.
We need about twice the raw speed to go to the sun than to leave the sun.

Thus, we can conclude that, the speeding up the orbital speed of earth so it escapes the sun require the greater energy.

Learn more about orbital and escape velocity here:

brainly.com/question/28045208

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2 years ago

What is the great egg drop experiment about?

kondaur [170]

Whichever person or group can build something to protect the egg from cracking when it is dropped from a high spot without it breaking or cracking wins

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3 years ago

Read 2 more answers

State which of the three materials would allow the thermometer to measure the

nignag [31]

Answer:

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2 years ago

Based on Newton's law of motion, which combination of rocket bodies and engine will result in the acceleration of 40 m/s ^2 at t

ad-work [718]

The question is incomplete. The complete question is :

The Rocket Club is planning to launch a pair of model rockets. To build the rocket, the club needs a rocket body paired with an engine. The table lists the mass of three possible rocket bodies and the force generated by three possible engines.

A 4-column table with 3 rows. The first column labeled Body has entries 1, 2, 3. The second column labeled Mass (grams) has entries 500, 1500, 750. The third column labeled Engine has entries 1, 2, 3. The fourth column labeled Force (Newtons) has entries 25, 20, 30.

Based on Newton’s laws of motion, which combination of rocket bodies and engines will result in the acceleration of 40 m/s2 at the start of the launch?

Body 3 + Engine 1

Body 2 + Engine 2

Body 1 + Engine 2

Body 1 + Engine 1

Solution :

Given :

Body Mass (gram) Engine Force (newtons)

1 500 1 25

2 1500 2 20

3 750 3 30

The body 1 has a mass of 500 gram which is equal to 0.5 kg

And engine 2 has a force of 20 newtons.

We know that according to Newton's laws of motion,

Force = mass x acceleration

20 = 0.5 x acceleration

Acceleration $=\frac{20}{0.5}$

$=\frac{200}{5}$

$= 40 \ m/s^2$

Therefore, based on laws of motion of Newton, the Body 1 + Engine 2 combination of the rocket bodies and engines will result in an acceleration of $40 \ m/s^2$ at the start of the launch.

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3 years ago

Which of the following prefixes represents the largest value

Zigmanuir [339]

C should be right ok

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3 years ago