magnetic field

Thân thiện

A bar magnet sits on a table with iron filings showing its magnetic field.

Definition

Noun: 1. A region of space around a magnet or a moving electric charge where magnetic forces can be detected. It is an invisible field that exerts a force on other magnets and on moving electric charges. The strength and direction of the field are often represented by imaginary lines of force.

Usage

The term "magnetic field" is used to describe the physical phenomenon and its properties. It is typically a non-count noun when referring to the general concept, but can be used in a countable way when referring to specific instances or types. * The magnetic field of a bar magnet can be visualized using iron filings. * A changing magnetic field can induce an electric current in a wire. * The Earth's magnetic field protects us from solar radiation.

Examples

• Scientists measured the strength of the magnetic field.
• The compass needle aligns itself with the local magnetic field.
• Electric motors operate by using a magnetic field to create motion.

Advanced Usage

• "To generate a magnetic field": To create a magnetic field, typically by moving electric charges (current) or through intrinsic material properties.
  • An electromagnet generates a powerful magnetic field when electricity flows through its coil.
• "Magnetic field lines": The conceptual lines used to represent the direction and strength of a magnetic field.
  • The density of the magnetic field lines indicates the strength of the field.

Variants and Related Words

• Magnetic flux (n): A measure of the total magnetic field passing through a given area.
• Magnetosphere (n): The region of space surrounding an astronomical object where its magnetic field is the dominant control.
• Electromagnetic field (n): A physical field produced by moving electric charges, combining both electric and magnetic field components.

Synonyms

• Field of magnetic force: A more descriptive synonym.
• B-field: A common technical term in physics, representing the magnetic flux density.

Related Phrases

• "To be within a magnetic field": To be located inside the area of influence of a magnet.
  • The metal object became magnetized because it was within the strong magnetic field.
• "To shield from a magnetic field": To protect an object or area from the influence of a magnetic field.
  • The sensitive equipment was placed inside a special case to shield it from external magnetic fields.

Học thuật

Noun

1. the lines of force surrounding a permanent magnet or a moving charged particle

Từ đồng nghĩa

• magnetic flux
• flux