Magnetism And Matter Flashcards
What is the SI unit of magnetic field strength (H)?
A m⁻¹
What is the SI unit of magnetic induction (B)?
tesla (T)
What is the SI unit of magnetic moment (M)?
A m²
Classify the following materials with regard to magnetism: Cobalt, Nickel, Manganese, Bismuth, and Copper, Oxygen
- Ferro magnetic: Cobalt, Nickel
- Dia magnetic: Bismuth, Copper
- Para magnetic: Manganese, Oxygen
What is the formula for the magnetic moment of a solenoid?
M = NiA
Why do magnetic lines form continuous closed loops?
The magnetic poles N and S always exist together in pairs.
What happens to compass needles at the Earth’s pole?
- A compass needle will not show any particular direction in the horizontal plane
- A dip needle stands vertically down at the north pole and up at the south pole
Define magnetic susceptibility.
It is the property of a material that indicates the degree of magnetization in response to an applied external magnetic field.
What is the unit of magnetic susceptibility?
It has no units.
Define magnetic declination.
It is the angle between the ‘Geographical Meridian’ and the ‘Magnetic Meridian’ at a given place.
Define magnetic inclination or angle of dip.
It is the angle between the ‘Total Earth’s field’ in its ‘Horizontal line’ and magnetic meridian at a given place.
Define Curie Temperature?
The temp at which ferromagnetic substance change to paramagnetic substance.
Tc= 1043K
