The coercivity of a permanent magnet is `4.0times10^(4)``A/m` .The magnet is placed inside a solenoid `15cm` long having `600` turns.A current is passed in the solenoid to demagnetise it completely.The current will be

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

A bar magnet has a coercivity of (4000 Am^-1) It is desired to demagnetize by inserting it inside a solenoid 10 cm long and having 500 turns. The current which should be carried by solenoid is Consider ideal solenoid)

A bar magnet has coercivity 4xx10^(3) Am^(-1) . It is desired to demagnetise it by inserting it inside a solenoid 12 cm long and having 60 turns. The current that should be sent through the solenoid is 1. 8 A 2. 6 A 3. 4.5 A 4. A

An iron rod of volume 10^(-4)m^(3) and relative permeability 1000 is placed inside a long solenoid wound with 5 "turns"//"cm" . If a current of 0.5 A is passed through the solenoid, then the magnetic moment of the rod is

An iron rod of volume 10^(-4)m^(3) and relative permeability 1000 is placed inside a long solenoid wound with 5 turns"/"cm . If a current of 0.5 A is passed through the solenoid, then the magnetic moment of the rod is

A bar magnet is demagnetized by inserting it inside a solenoid of length 0.2 m, 100 turns, and carrying a current of 5.2 A. The coercivity of the bar magnet is :