batejavizb
2022-09-25
Answered

How do I calculate the pull force of a cylindrical electromagnet to Iron as a function of distance? Is there any difference betweeen magnets and electromagnets?

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Rayna Aguilar

Answered 2022-09-26
Author has **14** answers

It's a very hard problem. If magnetism behaved like gravity, you could break up the plane and magnet into small dipoles and sum up all of the dipole-dipole interaction energies for all possible pairs (this would make a hex-tuple integral!). The force is simply the rate of change of the total energy. However, you need to first calculate the induced magnetization of iron, which is complicated and has a "saturation" behavior.

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If a conductor carrying current is placed inside a magnetic field, we know that there is the Lorentz force pushing the wire. But what about the attraction force between the wire's field and the magnet/electromagnet's field? So, isn't there really two forces involved? Attraction due to two magnetic field, and Lorentz force?

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An electromagnet was connected to a 12v battery and I verified that it was working. I then touched the electromagnet to a strong regular magnet (rated to hold over 50 kg). There was a strong force between the magnets. I then disconnected the electromagnet from power, reversed the wires, and turned it back on. I expected to feel the electromagnet repel the other magnet, but instead they two magnets got stuck together again. It seems like reversing the wires had no affect on the polarity of the electromagnet.

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Heat means stored kinetic energy in matter. Microwave owens and induction heaters works on increasing kinetic energy on matter. Is it possible to make inverse of this heaters like cooler. Can we decrese kinetic energy by using like electromagnetic slower device? It will change many things in engineering.

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A very long, uniformly charged cylinder has radius R and linear charge density $\lambda$.

a. Find the cylinder's electric field strength outside the cylinder, $r\ge R$. Give your answer as a multiple of $\frac{\lambda}{{\xi}_{0}}$.

Express your answer in terms of some or all of the variables R, r, and the constant $\pi$.

b. Find the cylinder's electric field strength inside the cylinder, $r\le R$. Give your answer as a multiple of $\frac{\lambda}{{\xi}_{0}}$.

Express your answer in terms of some or all of the variables R, r, and the constant $\pi$.

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Imagine if you have a magnetic material and you fix it into a position between two electomagnets, or perhaps in the center of a sphere of electomagnets. Is it possible that you could apply enough force to crush the magnetic material such that it becomes a black hole?

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Particle accelerators use electromagnets to change the direction in which charged particles travel. How does a charged particle move within a magnetic field?

(A) It moves in the same direction as the magnetic field lines.

(B) It moves in the direction opposite to the magnetic field lines.

(C) lt comes to a stop.

(D) It moves in a direction perpendicular to the magnetic field üines.

(E) none of the above.

(A) It moves in the same direction as the magnetic field lines.

(B) It moves in the direction opposite to the magnetic field lines.

(C) lt comes to a stop.

(D) It moves in a direction perpendicular to the magnetic field üines.

(E) none of the above.