Câmpul Magnetic1

What is a magnetic field?

• Area around a magnet where there is no magnetic force

• Region around a magnetic material or moving electric charge within which the force of magnetism acts

• Type of field where crops are grown using magnetic technologies

• Type of force that repels all magnetic materials

What force does a charged particle experience when moving in a magnetic field?

• Gravitational force

• Electric force

• Magnetic force

• Frictional force

What are the two types of magnetic poles?

• Eastern and western poles

• Positive and negative poles

• North and south poles

• Upper and lower poles

How can materials be magnetized?

• Immersion in water

• Irradiation with sunlight

• Exposure to a magnetic field or rubbing with a magnet

• Heating to high temperature

What is the phenomenon of generating electromotive force in a closed circuit due to a change in magnetic flux?

• What is static electricity

• Electromagnetic induction

• Chemical reaction

• Thermal conductivity

List two common magnetic materials.

• copper and aluminum

• iron and steel

• wood and plastic

• gold and silver

What is the process of producing a magnetic field in a material due to the presence of an external magnetic field?

• Internal magnetization

• Induced magnetization

• External magnetization

• Spontaneous magnetization

What happens when the like poles of two magnets are brought close to each other?

• They become neutral.

• They create a magnetic field.

• They repel each other.

• They attract each other.

What is the unit of measurement for magnetic induction in the SI system?

• tesla (T)

• ampere (A)

• joule (J)

• watt (W)

How can the strength of an electromagnet be increased?

• Increase the current flowing through the coil, or add more turns to the coil.

• Use a non-magnetic material for the coil

• Remove turns from the coil

• Decrease the current flowing through the coil