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
2 A
B
4 A
C
`6 A
D
8 A
Text Solution
Verified by Experts
The correct Answer is:
D
Topper's Solved these Questions
MAGNETISM
ERRORLESS |Exercise Magnet and it s Properties|15 Videos
MAGNETISM
ERRORLESS |Exercise Earth Magnetism|8 Videos
MAGNETIC EFFECT OF CURRENT
ERRORLESS |Exercise Exercise|394 Videos
RAY OPTICS
ERRORLESS |Exercise SET|25 Videos
Similar Questions
Explore conceptually related problems
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
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
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)
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 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 :
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 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
A long solenoid of 50 cm length having 100 turns carries a current of 2.5A. The magnetic field at centre of solenoid is:
