Electricity and Magnetism

Answer: a) Magnetization

Explanation: Magnetization is the process by which a material is made into a magnet by aligning its magnetic domains.

Answer: d) Aluminum

Explanation: Aluminum is not a magnetic material because it does not have unpaired electrons in its outer shell, which are necessary for creating a magnetic field.

Answer: b) Demagnetization

Explanation: Demagnetization is the process by which a magnet loses its magnetization and becomes a non-magnetic material.

Answer: a) Opposite poles attract each other, and like poles repel each other.

Explanation: Opposite poles of a magnet have opposite magnetic fields and are attracted to each other, while like poles have the same magnetic field and repel each other.

Answer: a) Magnetic field

Explanation: The magnetic field is the region around a magnet where its magnetic force can be detected.

Answer: d) Ferromagnetic materials

Explanation: Ferromagnetic materials such as iron, nickel, and cobalt can be magnetized because they have unpaired electrons in their outer shells that can be aligned to create a magnetic field.

Answer: a) Induction

Explanation: Induction is the process by which a changing magnetic field creates an electric field, which can induce an electric current in a conductor.

Answer: d) Magnetometer

Explanation: A magnetometer is a device used to measure the strength and direction of a magnetic field.

Answer: d) Lodestone

Explanation: Lodestone is a naturally occurring magnetized mineral that is made up of magnetite.

Answer: b) Paramagnetism

Explanation: Paramagnetism is a type of magnetism that is only temporary and occurs when a material is placed in an external magnetic field. This type of magnetism is caused by the alignment of magnetic moments in the material with the external magnetic field, but it disappears once the external field is removed.