The current required to be passed through a solenoid of 15 cm length and 60 turns in order to demagnetise a bar magnet of magnetic intensity `2.4 xx10^3` Am^(-1) is._______ A.

The coercitivity of a small magnet where the ferromagnet gets demagnetized is 3 xx 10^(3) Am^(-1) . The current required to be passed in a solenoid of length 10 cm and number of turns 100 , so that the magnet gets demagnetized when inside the solenoid , is :

A long solenoid of 50 cm length having 100 turns carries a current of 2.5A. The magnetic field at centre of solenoid is:

Find the amount of current required to demagnetise a permanent magnet of coercivity 3 xx 10^4 Am^(-1) kept inside a 0.2 m long solenoid of 500 turns.

A current of 1.6 A flows through a long solenoid, having 8 turns/cm. The magnetic induction at the end of the solenoid along its axis 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.

A tightly-wound, long solenoid having 50 turns cm^(-1) , carris a current of 4.00 A . Find the magnetic intensity H and the magnetic field B at the centre of the solenoid. What will be the values of these quantities if an iron core is inserted in the solenoid and the magnetization I in the core is 4.00 xx 10^6 A m^(-1) ?

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