Magnets 4

A ​ (a)   is a special object that has a ​ (b)   field around it. It can attract objects made of elements like iron, ​ (c)   , and nickel. Magnets have two poles: the ​ (d)   and the south pole. When you bring the same poles of two magnets close, they ​ (e)   each other, but when you bring different poles close, they attract each other

• magnet
• magnetic
• cobalt
• north pole
• repel

Magnetic Fields

Around every magnet is an invisible force field called a ​ (a)   field. Magnets can either ​ (b)   el other magnets or magnetic materials through this field. This field ​ (c)   from the north pole and ​ (d)   at the south pole, creating a continuous loop. A magnet can exert a force within its magnetic field. The ability of a magnet to exert force is called ​ (e)   .

• magnetic
• attract or rep
• magnetism
• goes out
• goes in

A ​ (a)   field is an ​ (b)   field around magnets where the force of the magnet can be felt. It goes out from the north pole and ​ (c)   at the south pole, creating a ​ (d)   of magnetic force.

• magnetic
• invisible
• visible
• enters
• loop

Properties of Magnets

Magnets possess remarkable properties that distinguish them from other objects, making them a subject of fascination in the world of science.

• Indestructibility of Poles

• Every magnet has two poles: a north pole and a south pole. Opposite poles attract, and like poles repel each other.

• Non-Contact Force

• Magnets can exert forces at a distance, attracting or repelling objects without direct contact.

• Polarity

• When a magnet is split into two pieces, each piece retains both a north and a south pole; a magnet cannot be divided into a north-only or south-only piece.

Properties of Magnets

Magnets possess remarkable properties that distinguish them from other objects, making them a subject of fascination in the world of science.

• Strength Variation with

  Distance

• The strength of a magnetic field decreases as the distance from the magnet increases.

• Directionality

• Magnetic field lines emanate from the

  north pole and return to the south pole, visually representing the magnetic field around a magnet.

• Field Lines

• Magnetic forces are strongest at the poles of the magnet, where the magnetic field lines are most concentrated.

Types of Magnets

​ (a)   magnets are special because they ​ (b)   , even when they are not near other magnets or electric currents. One of the most magnificent examples of a permanent magnet is ​ (c)   itself. The planet acts as a ​ (d)   , with magnetic materials in its core and surface contributing to a magnetic field that envelops the entire globe.

• Permanent
• keep their magnetic power all the time
• Earth
• giant magnet

Types of Magnets

​ (a)   magnets act like magnets only​ (b)   . For example, if a needle, which is made of a material that can be magnetized, is rubbed with a magnet, it will start to behave like a magnet itself, but only for a short time. This is because it ​ (c)   permanently.

• Temporary
• for a while or when certain conditions are met
• does not hold onto its magnetic properties

Types of Magnets

Another type of temporary magnet is the ​ (a)   , which is created by running

electricity through ​ (b)   . The cool thing about electromagnets is that they can be turned​ (c)   with electricity. When the electric current flows, they become strong magnets, but they lose their magnetic power once the electricity stops. It only becomes a magnet when electric current flows through it.

• electromagnet
• a coil of wire wrapped around an iron core
• on and off

​ (a)   are super useful and are used in many different things around us, from doorbells and ​ (b)   to big machines in junkyards that pick up cars. These materials behave like magnets only when they are within a magnetic field. ​ (c)   from the field, they lose their magnetic properties.

• Electromagnets
• Once removed
• speakers

Forces Exerted by Magnets

​ (a)   is exerted by magnets on magnetic materials even without direct contact. It is because of the magnetic field surrounding the magnets. A magnet can affect a magnetic object if it is ​ (b)   . Magnetism is ​ (c)   at the poles, while no magnetism is present outside the magnetic field.

• Magnetism
• within a magnetic field
• strongest