Differentiate between bar magnet and electromagnet.
Answer
Verified596.5k+ views
Hint The basic difference between them is that a bar magnet is a permanent magnet whereas an electromagnet is a temporary magnet. An electromagnet is formed when an electric current is passed through wires wound around soft metalcore. An electromagnet loses its magnetism once the current flow is stopped.
Complete Step by step solution
Following are the differences between a bar magnet and an electromagnet-
Note A ferromagnetic material can be converted into a permanent magnet if it is kept under a constant magnetic field for a long period. Thus, if instead of a soft iron core, we used a magnetically hardcore (ferromagnetic material), the magnetic properties are retained even after the current flow is stopped.
Complete Step by step solution
Following are the differences between a bar magnet and an electromagnet-
| BAR MAGNET | ELECTROMAGNET |
| A bar magnet is a permanent magnet. | An electromagnet is a temporary magnet. |
| The magnetism is caused by electron spins. These electrons spin in a particular orientation around the nucleus of ferromagnetic material and cause magnetism. | The magnetism is caused by passing electricity through a conductor and winding it around a core, to align the electrons in a proper orientation. |
| The strength of the magnetic field produced by a bar magnet is constant. | The strength of the magnetic field produced by an electromagnetic can be varied, depending on the current that passes through the winding or the number of turns. |
| The polarity of a bar magnet cannot be changed. | The polarity of an electromagnet can be changed by reversing the direction of the current or the winding. |
| Magnetically hard iron/steel is used to manufacture a bar magnet because once magnetized, it can retain the magnetic property by itself. This property is called ‘remanence’. | A soft iron core is used in the electromagnets, ‘soft’ means that this material gets magnetized and demagnetized easily, which allows the electromagnet to be turned on and off easily. |
| Examples of permanent magnets include bar magnets, horseshoe magnets, disc magnets, etc. | Examples of electromagnets include solenoid and toroid. |
Note A ferromagnetic material can be converted into a permanent magnet if it is kept under a constant magnetic field for a long period. Thus, if instead of a soft iron core, we used a magnetically hardcore (ferromagnetic material), the magnetic properties are retained even after the current flow is stopped.
Recently Updated Pages
Which of the following graphs shows the variation of class 12 physics CBSE
Draw a labelled diagram of the human male reproductive class 12 biology CBSE
Describe the experiment to compare the emf of two cells class 12 physics CBSE
What is standard hydrogen electrode
What is conventional current and electric current class 12 physics CBSE
2Bromopentane is treated with an alcoholic KOH solution class 12 chemistry CBSE
Trending doubts
A member of Simon commission later became Prime Minister class 12 social science CBSE
Suicide bags of cells are aEndoplasmic reticulum bLysosome class 12 biology CBSE
Differentiate between lanthanoids and actinoids class 12 chemistry CBSE
Sketch and label the Malpighian body class 12 biology CBSE
State the principle of an ac generator and explain class 12 physics CBSE
Why is the cell called the structural and functional class 12 biology CBSE