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.

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?

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 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?

The hyterisis loss for a sample of 12kg is 300Jm^-3cycl e^-1 . If density of iron is 7500kg//m^3 , calculate energy loss per hour at 50cycl e//sec .

Hysterisis loss for a sample of 120kg is 300Jm^-3//cycl e . Frequency of supply is 50cycl e//s . If density of iron is 7500kg//m^3 , find energy loss in 60 minutes.

A iron rod is placed parallel to magnetic field of intensity 2000 A/m The magnetic flux through the rod is 6xx10^(-4) Wb its cross sectional area is 3 cm^(2) The magnetic permeability of the rod in Wb/A -m is

A piece of iron of density 7.8xx10^-3(kg)/(m^3) and volume 100cm^3 is totally immersed in water. Calculate (a) the weight of the iron piece in air (b) the upthrust and (c ) apparent weight in water.

A streched string is forced to transmit transverse waves by means of an oscillator coupled to one end. The string has a diameter of 4mm . The amplititude of the oscillation is 10^(-4) m and the frequency is 10Hz . Tension in the string is 100 N and mass density of wire is 4.2xx10^(3)kg//m^3 . Find (a) the equation of the waves along the string (b) the energy per unit volume of the wave (c) the average energy flow per unit time across any section of the string and (d) power required to drive the oscillator.

A specimen of iron weighing 6kg loses 8*64xx10^4J of energy per hour when subjected to 50c//s a.c. If density of iron is 6000km//m^3 , what is the hysterisis loss per unit volume per cycle?