Need Help?

Get in touch with us

bannerAd

Magnetism and Magnetic Field – Experiments

Aug 24, 2022
link

Introduction 

Magnetic Force:  

Magnetic force is the force of attraction or repulsion which acts between two magnets. 

Nature of Magnetic Force: 

  • Magnetic force is a non-contact force. 
  • Magnetic force is sometimes attractive and sometimes repulsive. 

Magnetic Field: 

The magnetic field is the region around a magnet where the force of attraction or repulsion can be detected. 

We can study the magnetic field of a magnet using a magnetic needle. 

Magnetic field

Explanation: 

Plotting Magnetic Field Lines 

  • The magnetic field around a magnet can be detected by plotting magnetic field lines. 
  • The magnetic field lines around a magnet can be observed by moving a magnetic compass around a magnet. 
Magnetic Field

Magnetic Field Lines 

  • Magnetic field lines are the imaginary lines around a magnet along which the north pole of a magnetic compass needle tends to move. 
  • Magnetic field lines are used to show the direction of magnetic force. 

Properties of Magnetic Field Lines: 

  • The magnetic field lines emerge at the north pole and merge at the south pole. 
  • The magnetic field lines are very close at the poles where the magnetic field is strong. 
  • The magnetic field lines do not intersect each other. 
  • The relative strength of the magnetic field is shown by the degree of closeness of the field lines; the closer the line, the stronger the field. 

Different patterns of Magnetic Field Lines: 

Magnetic Field of a Bar Magnet 

Magnetic Field 2

Magnetic Field of a Horseshoe Magnet 

Magnetic Field

Magnetic Field of two Bar Magnet having like unlike poles towards each other 

Magnetic Field

Magnetic Field of two Bar Magnet having like poles towards each other 

Magnetic Field

Oersted’s Experiment: 

In the year 1820, Hans Christian Oersted discovered the magnetic effect of electric current. Oersted recorded the following observations. 

  • If a magnetic compass is placed near a conductor carrying current wire, the needle is deflected. 
  • If the direction of the current is changed, the needle shows deflection in just the opposite direction. 
  • When there is no current in the current-carrying wire, the needle shows no deflection. 
Oersted’s Experiment

Conclusion of Oersted’s Experiment: 

A current-carrying conductor creates a magnetic field around it. This magnetic field exerts a magnetic force on the magnetic needle, due to which it gets deflected. Oersted’s experiment proves that a current-carrying conductor is always associated with a magnetic field. 

parallel

Summary

  • Magnetic Field: The region around a magnet where the force of attraction or repulsion can be detected is called the magnetic field.
  • the magnetic field lines around a magnet can be observed by moving a magnetic compass around a magnet.
  • Properties of Magnetic Field lines:
  • The magnetic field lines emerge at the north pole and merge at the south pole.
  • The magnetic field lines are very close at the poles where the magnetic field is strong.
  • The magnetic field lines do not intersect with each other.
  • The relative strength of the magnetic field is shown by the degree of closeness of the field lines; the closer line, the stronger the field.
  • In the year 1820, Hans christian oersted discovered the magnetic effect of electric current.
  • Oersted’s Experiment Findings:
  • If a magnetic compass is placed near a conductor carrying current wire, the needle is defected.
  • If the direction of the current is changed, the needle shows deflection in just the opposite direction.
  • When there is no current in the current carrying wire , the needle shows no deflection.
  • A current- carrying conductor has a magnetic field around it.

 

parallel

Comments:

Related topics

Define Position Time Graph and its Types

Key Concepts • Slope of a graph • Position time graph • Slope of s-t graph = Velocity • Types of position time graphs Introduction An object in a uniform motion covers equal distances in equal intervals of time. This also indicates that it moves at a constant velocity. When its position at different instants […]

Read More >>

Magnetic Field Lines: Definition, Explanation and Q&A

Key Concepts Magnetic Field Magnetic Field Lines properties of magnetic field lines Uniform and non uniform magnetic lines Introduction Two magnets when placed close to each other attract and stick to each other. However, if we go on increasing the distance between them, the attraction between them reduces gradually to such an extent that they […]

Read More >>

The Life Cycles of Stars: Meaning and Example

Key Concepts Stars Analysis of starlight Composition of stars Stars’ temperature Size and mass of stars Stages of life cycle of a star Introduction Stars are huge, shining balls of extremely hot gas (known as plasma) in space. The Sun is our nearest star. During the nighttime, many other stars are visible to the naked […]

Read More >>

Mirror Formula

Key Concepts New cartesian sign convention Mirror formula Solving problems using the mirror formula Introduction When dealing with the reflection of light by spherical mirrors mathematically, a set of sign conventions is followed, called the New Cartesian Sign Convention. According to this convention, the pole of a spherical mirror is taken as the origin and […]

Read More >>

Other topics