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Related Concept Videos

Magnetic Fields01:27

Magnetic Fields

A moving charge or a current creates a magnetic field in the surrounding space, in addition to its electric field. The magnetic field exerts a force on any other moving charge or current that is present in the field. Like an electric field, the magnetic field is also a vector field. At any position, the direction of the magnetic field is defined as the direction in which the north pole of a compass needle points.
A magnetic field is defined by the force that a charged particle experiences...
Magnetism01:30

Magnetism

Magnets are commonly found in everyday objects, such as toys, hangers, elevators, doorbells, and computer devices. Experimentation on these magnets shows that all magnets have two poles: one is labeled north (N) and the other south (S). Magnetic poles repel if they are alike and attract if unlike. Moreover, both poles of a magnet attract unmagnetized pieces of iron.
An individual magnetic pole cannot be isolated. No matter how small, every piece of a magnet contains a north pole and a south...
Potential Due to a Magnetized Object01:24

Potential Due to a Magnetized Object

Magnetic dipoles in magnetic materials are aligned when placed under an external magnetic field. For paramagnets and ferromagnets, dipole alignment occurs in the direction of the magnetic field. However, the dipoles align opposite to the field in the case of diamagnets. This state of magnetic polarization due to the external field is called magnetization. Magnetization is defined as the dipole moment per unit volume. It plays a similar role to polarization in electrostatics.
The vector...
Torque On A Current Loop In A Magnetic Field01:13

Torque On A Current Loop In A Magnetic Field

The most common application of magnetic force on current-carrying wires is in electric motors. These consist of loops of wire, which are placed between the magnets with a magnetic field. When current flows through the loops, the magnetic field applies torque, which causes the shaft to rotate, thus converting electrical energy to mechanical energy.
Consider a rectangular current-carrying loop containing N turns of wire, placed in a uniform magnetic field. The net force on a current-carrying loop...

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High-Speed Magnetic Tweezers for Nanomechanical Measurements on Force-Sensitive Elements
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A 10 tesla table-top controlled waveform magnet.

Aditya N Roy Choudhury1, V Venkataraman

  • 1Department of Physics, Indian Institute of Science, Bangalore 560012, India. aditya@physics.iisc.ernet.in

The Review of Scientific Instruments
|May 8, 2012
PubMed
Summary
This summary is machine-generated.

Controlled waveform magnets (CWMs) offer programmable magnetic field pulses. This table-top system achieves 10 tesla with precise waveform control for advanced research applications.

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Area of Science:

  • Pulsed Magnet Technology
  • High Magnetic Field Generation
  • Experimental Physics

Background:

  • Controlled waveform magnets (CWMs) allow users to program magnetic field pulse shapes over time.
  • Traditional pulsed magnets offer limited control over the field's rate of change.
  • Precise control over magnetic field magnitude and its temporal dynamics is crucial for various scientific experiments.

Purpose of the Study:

  • To present a table-top controlled waveform magnet (CWM) system.
  • To demonstrate the capability of generating user-shaped magnetic field waveforms up to 10 tesla.
  • To showcase precise control over both magnetic field magnitude and its rate of change.

Main Methods:

  • A capacitor bank drives the table-top CWM system.
  • High-current switching is achieved using paralleled Insulated Gate Bipolar Transistor (IGBT) chips.
  • A crowbar diode module is constructed from paralleled Silicon Carbide (SiC) Schottky diodes.

Main Results:

  • The CWM system successfully generated user-defined magnetic field waveforms.
  • Achieved peak magnetic fields up to 10 tesla with controlled shapes, including flat-tops and triangular pulses.
  • Generated waveforms for durations of 10-20 ms with less than 1% ripple.

Conclusions:

  • The developed table-top CWM provides unprecedented control over magnetic field pulse shaping.
  • The system is capable of generating high-fidelity magnetic field waveforms for diverse experimental needs.
  • This technology enables advanced research requiring precise temporal magnetic field control.