Answer: Option B. -> Magnetic field
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B
Magnetic field is a region where a magnet exhibits its magnetic influence. Magnetic substances which are within the magnetic field of a magnet, get attracted to it. The picture below shows themagnetic field of a magnet.

Answer: Option B. -> at two extreme ends of the magnet
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B
A bar magnet consists of two poles which are always apart and never located at the middle.Poles of a bar magnet are always located at two extreme ends of the magnet.

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Electromagnet: 1 Mark
Uses: 1 Mark
An electromagnet is a magnet that runs on electricity. Unlike a permanent magnet, the strength of an electromagnet can easily be changed by changing the amount of electric current that flows through it. The poles of an electromagnet can even be reversed by reversing the flow of electricity. Electromagnets are very strong magnets and they are used in lifting heavy materials like in cranes. They are found in generators, motors and a lot of electronic devices.

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Method: 2 Marks
Suspend the bar magnet freely with the help of a thread tied to the center of it, the end that points to the north direction will be regarded as the north pole of the magnet and the other end is regarded as the south pole.

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Each Point: 1 Mark
In N - N, repulsion will occur as like poles repel each other.
In N - S, attractionwill occur as unlike poles attract each other.
In S - S, repulsion will occur as like poles repel each other.

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Each point: 1 Mark
$\begin{array}{cc}\text{Column I}& \text{Column II}\\ \text{Boat gets attracted towards the bar magnet.}& \text{Boat is made of magnetic material}\\ \text{Boat is not affected by the magnet.}& \text{Boat is made of non-magnetic material}\\ \text{Boat moves towards the magnet if north pole of the magnet is brought near its head.}& \text{Boat is fitted with a bar magnet with south pole towards its head.}\\ \text{Boat moves away the magnet if north pole of the magnet is brought near its head.}& \text{Boat is fitted with a bar magnet with north pole towards its head.}\\ \text{Boat floats without changing its direction.}& \text{Boat has a small magnet fixed along its length.}\end{array}$

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Yes/No: 1 Mark
Markings: 1 Mark
Activity: 3 Marks
Yes, the two pieces will act as individual magnets.
We can identify the ends of the magnets by the test of repulsion. When we bring the new ends of the magnets together, they will attract each other because when we break the magnet, it produces two poles opposite to one another on the broken ends.

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The two extreme ends of the bar magnet representits two poles.

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Classification: 1 Mark
Reason: 2 Marks
Magnetic materials: Steel, iron nails and cobalt are magnetic materials because they get attracted to magnets.
Non-magnetic materials: Rubber, wood, and plastic are non-magnetic materials because they show no effect when a magnet is brought near them.

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Magnetic compass: 2 Marks
Use: 1 Mark
The magnetic compass is a device containing a magnetic needle pivoted in a horizontal plane that indicatesNorth when held on the earth's surface.
Use: Magnetic compass is used to find directions. It is used by sailors to find the right direction during navigation.