The coercive force for a certain prmanent magnet is `4.0 xx 10^4 A m^(-1)`. This magnet is placed inside a long solenoid of 40 turns/cm and a current is passed in the solenoid to demagnetize it completely. Find the current.

The coercivity of a certain permanent magnet is 4.0xx10^(4)Am^(-1) . The magnet is placed insider a solenoid 20cm long having 700 turns and a current is passed in the solenoid to demagnetise it completely. Find the current

The coercive force for certain permanent magnet is 2times10^(4)A/m .This magnet is placed inside a long solenoid of 40 turns/cm and a current is passed in the solenoid to demagnetize the magnet.The value of current (in A) is

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.

The B_(H) curve for a ferromagnetic material is shown in the figure. The material is placed inside a long solenoid which contains 1000 turns/cm. the current that should be passed in the solenoid to demagnetize the ferromagnet completely is

The coercive force for a certain material is 10^4 A/m. A magnet made out of this material is placed inside a solenoid having 1000 turns/metre. What amount of electric current is required to demagnetise the material completely?

The coercivity of a small bar magnet is 4xx10^3Am^(-1) . It is inserted inside a solenoid of 500 turns and length 1 m to demagnetize it. The amount of current to be passed through the solenoid will be

The coercivity of a small bar magnet is 4xx10^3Am^(-1) . It is inserted inside a solenoid of 500 turns and length 1 m to demagnetize it. The amount of current to be passed through the solenoid will be