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 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 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 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 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?

A bar magnet having coercivity 4 xx 10^(3) Am^(-1) is demagnetised by inserting it inside a solenoid 10 cm long and having 50 turns. The current that should be sent through the solenoid is

The coercivity of a bar magnet is 120A//m . It is to be demagnetised by placing it inside a solenoid of length 120cm and number of turns 72. The current (in A) flowing through the solenoid is:

The B-H curve for a ferromagnet is shown in the figure. The ferromagnet is placed inside a long solenoid with 1000 turns/cm. The current that should be passed in the solenoid to demagnetise the ferromagnet completely is :

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

A bar magnet has a coercivity 8xx10^(3)A//m . It is desired to damagnetise it by inseting it inside a slenoid 6 cm long and having 60 turns. The current carreid by the solenoid should be