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:

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

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 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

The strength of the magnetic field in a long solenoid having 5000 turns per meter is 3.14x 10^(-2)T . The current flowing through the solenoid is

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

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 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 :