Home
Class 12
PHYSICS
The coercivity of a small magnet where ...

The coercivity of a small magnet where the ferromagnet gets demagnetized is `3xx10^(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

6A

B

30 mA

C

60 mA

D

3A

Text Solution

Verified by Experts

The correct Answer is:
D
`because B=mu_(0)H`
and `B=mu_(0)nI`
from equation 1 and 2
`H=n l rarr 3xx10^(3)=100/0.1 xxI`
`I=3A`
Promotional Banner

Topper's Solved these Questions

  • MAGNETOSTATICS

    MODERN PUBLICATION|Exercise RECENT COMPETITIVE QUESTION|5 Videos

  • MAGNETOSTATICS

    MODERN PUBLICATION|Exercise MULTIPLE CHOICE QUESTION (LEVEL II)|50 Videos

  • LAWS OF MOTION

    MODERN PUBLICATION|Exercise Revision test|43 Videos

  • MOCK TEST-1

    MODERN PUBLICATION|Exercise MCQs|47 Videos

Similar Questions

Explore conceptually related problems

Coercivity of a magnet where the ferromagnet gets completely demagnetized is 3 xx 10^(3) A m^(-1) , The minimum current required to be passed in a solenoid having 1000 turns per metre, so that the magnet gets completely demagnetized when placed inside the solenoid is

A solenoid of length 0.5 m has a radius of 1 cm and is made up of 500 turns. It carries a current of 5 A. What is the magnitude of the magnetic field inside the solenoid?

A solenoid length 0.4cm, radius 1 cm and 400 turns of wire. If a current of 5 A is passed through this solenoid, what is the magnetic field inside the solenoid ?

A solenoid 1.5 m long and 0.4 cm in diameter possesses 10 turns per cm length. A current of 5 A falls through it. The magnetic field at the axis inside the solenoid is

A circular coil of radius 10 cm and 100 turns carries a current 1 A. What is the magnetic moment of the coil ?

A circular coil of radius 10 cm and 100 turns carries a current 1A. What is the magnetic moment of the coil?

The magnetic field inside a toroidal solenoid of radius R is B . If the current through it is doubled and its radius is also doubled keeping the number of turns per unit length the same magnetic field produced by it will be :

A closely wound solenoid of 2000 turns and area of cross section 1.6 xx 10^(-4) m^(2) , and carrying a current of 4.0 A, is suspended through its centre allowing it to turn in a horizontal plane. What is the the magnetic moment asociated with the solenoid ?