Glenn Hopkins
2022-07-21
Answered

What spectrum of light are the electromagnetic waves that are in a field created by electricity?

You can still ask an expert for help

Izabelle Frost

Answered 2022-07-22
Author has **13** answers

This question is not clear - what you mean "e.m. waves that are in a field created by electricity"? A field around static electric charges contains no waves.

asked 2022-05-18

How to derive ferromagnet Lagrangian from the Heisenberg model: $H=-{J}_{ij}{S}_{i}{S}_{j}$ ? I understand how to obtain potential energy term, but it is not clear how to get "kinetic energy".

$L=\int {d}^{2}x\frac{\rho}{2}[\frac{({\mathrm{\partial}}_{t}\theta {)}^{2}}{{v}^{2}}-(\mathrm{\nabla}\theta {)}^{2}]$

$L=\int {d}^{2}x\frac{\rho}{2}[\frac{({\mathrm{\partial}}_{t}\theta {)}^{2}}{{v}^{2}}-(\mathrm{\nabla}\theta {)}^{2}]$

asked 2022-07-23

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.

asked 2022-07-21

Electrons' Motion in an electromagnet is on the order of ${10}^{-4}$ m/s. That charge can be mechanically rotated in a capacitor with a million times more velocity (B produced being proportional to charge's velocity ).

Forces causing eddy currents would help to negate net magnetic field in an ordinary capacitor. However, if radially oriented, unidirectionally conducting (" chair " ) carbon nanotubes are rotated, the electrons would be relatively constrained from eddy currents.

It seems like this would allow greater magnetic field production compared to standard electromagnets.

Forces causing eddy currents would help to negate net magnetic field in an ordinary capacitor. However, if radially oriented, unidirectionally conducting (" chair " ) carbon nanotubes are rotated, the electrons would be relatively constrained from eddy currents.

It seems like this would allow greater magnetic field production compared to standard electromagnets.

asked 2021-11-21

A solenoid is designed to produce a magnetic field of 0.0270 T at its center. It has radius 1.40 cm and length 40.0 cm, and the wire can carry a maximum current of 12.0 A. (a) What minimum number of turns per unit length must the solenoid have? (b) What total length of wire is required?

asked 2022-08-08

How does induced magnetism work with magnetic induction and magnetic domain?

asked 2021-02-05

Two adults and a child want to push a wheeled cart in thedirection marked x in Fig. 4.29 The two adults push with horizontalforces $F}_{1}{\textstyle \phantom{\rule{1em}{0ex}}}\text{and}{\textstyle \phantom{\rule{1em}{0ex}}}{F}_{2$ as shown in the figure. (a)Find the magnitude and direction of the smallest force that thechild should exerts the minimum force found in part (a), the cartaccelerates at 2.0 $\frac{m}{{s}^{2}}$ in the +x direction. What is theweight of the cart?

asked 2022-07-23

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