Earth's Magnetism

The same poles of different magnets _____ each other.

Unlike poles of different magnets _____ each other.

The Law states that the force of attraction or repulsion between two magnetic poles is _________ proportional to the product of the strengths of the poles and _________ proportional to the square of the distance between them.

• directly / inversely

• conversely / directly

• inversely / directly

• directly / indirectly

The total number of magnetic field lines penetrating an area is called ____.

• Magnetism

• Magnetic equator

• Magnetic Flux

• Magnetic poles

____ produce magnetic field on its own at all times. They will retain its magnetism when it is removed from the magnetizing field.

• Soft iron

• Permanent magnets

• Induced magnets

• Solid iron

Are materials when placed close to a permanent magnet will temporarily behave like magnet as it gets induced by the magnetic lines of forces. It will lose magnetism when removed from magnetizing field.

• Hard iron

• Ferromagnets

• Permanent magnets

• Brass

Is defined as the magnetic moment change per unit volume or pole strength per unit area.

• Intensity of magnetization

• Permeability

• Magnetic susceptibility

• Magnetic strength

Is the measure of the ability of a material to support the formation of a magnetic field within itself.

• Magnetic structure

• Magnetic susceptibility

• Permeability

• Intensity of magnetization

Is a dimensionless proportionality constant that indicates the degree of magnetization of a material in response to an applied magnetic field.

• Magnetic intensity

• Permeability

• Intensity of magnetization

• Magnetic susceptibility

__________ is defined as the line around the earth where the magnetic field is horizontal or parallel to the earth's surface.