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`.

Answer

`5*4xx10^4J//hour`

Explanation

Here, energy loss due to hysterisis
`=300Jm^-3cycl e^-1`
`rho=7500kg//m^3, m=15kg, v=50c//s`
Energy lost/hour=?
`V=m/rho=(15)/(7500)m^3=2xx10^-3m^3`
Energy lost/cycle =`300xx2xx10^-3=0*6`
Energy lost/sec`=0*6xx50=30J//s`
Energy lost/hour=`30xx60xx60`
`=5*4xx10^4J//hr`