Why an iron bar kept closer to a magnet can attract a pin?

Answer: The bar magnet induces a magnetic field in the iron bar because the iron bar is magnetic. Even if there is no contact between the bar magnet and the iron bar, iron being highly permeable, becomes magnetic. The iron bar in turn attracts the pin.

When a magnet is kept near a iron bar?

The iron bar acquires magnetism due to magnetic induction. If the magnet is removed, the iron bar loses its magnetism.

How is magnetism induced into an iron bar placed near a magnet?

The magnet induces a N pole at the nearest end of the bar. The iron bar and magnet attract each other. Like poles face each other. The magnet repels the iron bar.

What happens if an iron bar magnet is melted?

No, iron bar loses magnetism when melted. When heated the arrangement of molecules becomes random and the iron bar loses its magnetism.

Which regions of the magnet have more iron filings sticking to it?

(i) The ends of the magnet have more iron filings attached to it. (ii) These regions are called poles of the magnet.

What is the SI unit of flux density?

The tesla (symbol T) is the derived SI unit of magnetic flux density, which represents the strength of a magnetic field. One tesla represents one weber per square meter.

How do you use a compass to plot magnetic field lines?

Detecting magnetic fields

1. place the plotting compass near the magnet on a piece of paper.
2. mark the direction the compass needle points.
3. move the plotting compass to many different positions in the magnetic field, marking the needle direction each time.
4. join the points to show the field lines.

Does an Unmagnetised iron bar become magnetised when placed near a magnet?

An unmagnetised iron bar becomes magnetised when it is placed near a magnet. An unmagnetised steel bar can be magnetised by passing a current through it. The direction of magnetic field lines is from an S-pole to an N-pole. The N-poles of two magnets attract each other.

How can a piece of iron be induced into becoming a magnet?

A piece of iron can be induced into becoming a magnet by simply placing it in a strong magnetic field. If you place a paperclip near a magnet, it itself will become a magnet because the domains become aligned in the magnetic field.

Why does a bar magnet not retain its magnetism when melted?

Does it retain its magnetism? Melting point of iron a greater than its Curle temperature , So iron bar is no more ferromagnetic and does not retain its magnetism.

How will you convert a bar magnet into ordinary iron bar?

Take a rectangular piece of iron bar. Take a bar magnet and keep in contact with one of its poles with one edge of the bar of iron. Without lifting the bar magnet, move it along the length of the iron bar till you reach the other end.

When a bar magnet is brought near iron dust most of the dust stick?

Explanation : The pole, as we all know, is the location where the magnet’s strength is greatest. When we bring a magnet near the iron particles, more and more iron particles are attracted to the poles of the magnet. The existence of two poles in a magnet is indicated by this symbol.