InterviewSolution
Saved Bookmarks
InterviewSolution
| 1. |
The coercivity of a certain permanent magnet is `4*0xx10^4Am^-1`. This magnet is placed inside a solenoid `15cm` long and having `600turns`. Calculate the current required to demagnetise the magnet completely. |
|
Answer» Here, coercivity `=4*0xx10^4Am^-1` of magnet implies that magnetising intensity `H=4*0xx10^4Am^-1` is required to be applied in opposite direction to demagnetise the magnet. n=number of turns per unit length `=(600)/(15xx10^-2)=4000turns//m` As `H=nI :. I=H/n=(4*0xx10^4)/(4000)=10A` |
|