Demagnetisation

The hysterisis loss of a sample of iron is 300Jm^-3 cycl e^-1 . If density of iron is 7500kg//m^3 and mass of iron piece is 15kg , calculate energy lost/hour when the frequency of magnetisation/demagnetisation used in 50c//s .

An iron sample having mass 8*4kg is repeatedly taken over cycles of magnetisation and demagnetisation at a frequency of 50c//s . It is fount that 3*2xx10^4J of energy is dissipated as heat in the sample in 30min . If density of iron is 7200km//m^3 , what is the hysterisis loss?

An iron sample having mass 8*4kg is repeatedly taken over cycles of magnetisation and demagnetisation at a frequency of 50cps . It is found that energy of 3*2xx10^4J is dissipated as heat in the sample in 30 minutes. If the density of iron is 7200kg//m^3 , calculate the value of energy dissipated per unit volume per cycle in the iron sample.

An iron sample weighing 8*4kg is taken through repeated cycles of magnetisation and demagnetisation at a frequency of 50c//s . In 30 minutes, energy dissipated as heat in the sample is 3*2xx10^4J . If density of iron is 7200kg//m^3 , what is the energy dissipated per unit volume per cycle?

The magnetic force required to demagnetise the material is

Find the amount of current required to demagnetise a permanent magnet of coercivity 3 xx 10^4 Am^(-1) kept inside a 0.2 m long solenoid of 500 turns.

A piece of iron of mass 8.4 kg is repeatedly magnetised and demagnetised by an external periodic time varying magnetic field of frequency 50Hz. In the iron piece it is measured that rate of heat dissipation is 6.4xx10^(4)J//hr . If iron density is 7200Kg//m^(3) find the energy dissipated in iron piece per cycle per unit volume of it.

A magnet can be demagnetised by