Tirimwb
2022-07-23
Answered

How could you test the effects of heating and cooling on the magnetization of a bar magnet?

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tun1t2j

Answered 2022-07-24
Author has **13** answers

We can test effects of heating and cooling on the magnetization of a bar magnet by heating or cooling bar after what we can test its magnetic properties by putting it in contact with another magnet.

Result:

By cooling and heating magnet bar, after what we can put it in contact with another magnet to see how does it behave.

Result:

By cooling and heating magnet bar, after what we can put it in contact with another magnet to see how does it behave.

asked 2022-04-12

Consider the circuit shown in

photo

A)What are the magnitude and direction of the current in the $20\mathrm{\Omega}$

resistor in figure

Express your answer with the appropriate units. Enter positive value if the current is clockwise and negative value if the current is counterclockwise.

photo

A)What are the magnitude and direction of the current in the $20\mathrm{\Omega}$

resistor in figure

Express your answer with the appropriate units. Enter positive value if the current is clockwise and negative value if the current is counterclockwise.

asked 2022-05-08

Work done by the Magnetic Force

The magnetic part of the Lorentz force acts perpendicular to the charge's velocity, and consequently does zero work on it. Can we extrapolate this statement to say that such a nature of the force essentially makes its corresponding work independent of the choice of path, and hence that the magnetic force is conservative?

The magnetic part of the Lorentz force acts perpendicular to the charge's velocity, and consequently does zero work on it. Can we extrapolate this statement to say that such a nature of the force essentially makes its corresponding work independent of the choice of path, and hence that the magnetic force is conservative?

asked 2021-02-08

A window washer of mass M is sitting on a platform suspended by a system of cables and pulleys. He is pulling on the cable with a force of magnitude F.The cables and pulleys are ideal (massless and frictionless), and the platform has negligible mass.

Find the magnitude of the minimum force F that allows the window washer to move upward.

Express your answer in terms of the mass M and the magnitude of the acceleration due to gravity g.

asked 2022-05-10

$M=\sqrt{{\displaystyle \frac{4U}{3}}}\varphi $

where M is the ferromagnetic order parameter and $\varphi $ is the auxiliary field from the Hubbard-Stratonovich transformation. The book argues that because the above equation is correct, the mean field theory which is derived from the Hartree-Fock approach is equivalent to the the saddle point approximation formalism for H-S transformation auxiliary field Lagrangian. But I can not understand the equation.

where M is the ferromagnetic order parameter and $\varphi $ is the auxiliary field from the Hubbard-Stratonovich transformation. The book argues that because the above equation is correct, the mean field theory which is derived from the Hartree-Fock approach is equivalent to the the saddle point approximation formalism for H-S transformation auxiliary field Lagrangian. But I can not understand the equation.

asked 2022-07-23

(a) A car generator turns at 400 rpm when the engine is idling. Its 300-turn, 5.00 by 8.00 cm rectangular coil rotates in an adjustable magnetic field so that it can produce sufficient voltage even at low rpms. What is the field strength needed to produce a 24.0 V peak emf? (b) Discuss how this required field strength compares to those available in permanent and electromagnets.

asked 2022-07-21

If an ideal cylindrical inductor/electromagnet is charged and then discharged, will the energy lost by charging the inductor/electromagnet be equal to the energy gained by discharging it or will some of it be lost to radiation? Based on what I know about magnetism, there should be no loss.

asked 2022-05-07

Lets say you have an uniform prism magnet of Iron for example. How would you calculate the demagnetization field H which the bar magnet produces? As I understand, first you need the magnetization M which is the magnetic moments per volumen. But then what ? Or would you apply and external field to the bar magnet and see how it reacts, if this is the case, how does this work ?