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

The coercivity of a small magnet where the ferromagnet gets demagnetised is `3xx10^(3)A.m^(-1)` The current required to be passed in a solenoid of length 10cm and number of turns 100 so that the magnet gets demagnetised when inside the solenoid is

A

6A

B

30 mA

C

60 mA

D

`3 A`

Text Solution

Verified by Experts

The correct Answer is:
D
`B=mu_(0)nI " or, "(B)/(mu_(0))=nI" or, "H=(NI)/(L)[because B =mu_(0)H]`
`therefore" "I=(HL)/(N)=(3xx10^(3)xx10xx10^(-2))/(100)=3A`
Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • Magnetic Properties of Materials

    CHHAYA PUBLICATION|Exercise EXAMINTION ARCHIVE (AIPMT)|1 Videos

  • Magnetic Properties of Materials

    CHHAYA PUBLICATION|Exercise EXAMINTION ARCHIVE (NEET)|3 Videos

  • Magnetic Properties of Materials

    CHHAYA PUBLICATION|Exercise EXAMINTION ARCHIVE (WBJEE)|3 Videos

  • LIGHT WAVE AND INTERFERENCE OF LIGHT

    CHHAYA PUBLICATION|Exercise CBSE SCANNER|15 Videos

  • OPTICAL INSTRUMENTS

    CHHAYA PUBLICATION|Exercise CBSE SCANNER|8 Videos

Similar Questions

Explore conceptually related problems

A solenoid carrying 1 A current has a length of 1 m and contains 10000 turns. What is the magnetic field on the axis of the solenoid ?

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?

Knowledge Check

  • The intensity of magnetsation of a bar magnet is 5.0xx10^(4)A.m^(-1) The magnetic length and area of cross section of the magnet are 12cm and 1 "cm"^(2) Respectively. The magnitude of magnetic moment of this this bar magnet is (in SI unit)

    A
    `0.6`
    B
    `1.3`
    C
    `1.24`
    D
    `2.4`

    • Similar Questions

    Explore conceptually related problems

    The length of long straight solenoid is 10 cm and the number of turns in it is 200. If 1 A current flows through it, determine the magnetic field at any on the aixs of the solenoid.

    The length of straight solenoid is 10 cm, number of turns is 5000 , current through it is 10 mA and the relative permeability of the material of its 1500. Determine the magnetic intensity H and the magnetic field B on the axis of the solenoid .

    The intensity of magnetization of a bar magnet is 5.0 xx 10^4 A m^(-1) . The magnetic length and the area of cross section of the magnet are 12 cm and 1 cm^2 respectively. The magnitude of magnetic moment of this bar magnet is (in Si unit)

    Length of a solenoid is 50 cm and its total number of turns is 1250. if 2A current is a passed through it, what will be the magnetic field at any point on its axis ?

    A 0.5 m long solenoid has 500 turns and has a flux density of 2.52xx10^(-3)T at its centre. Find the current in the solenoid.

    A magnetic field of 100 G (1 G = 10^(-4) T) is required which is uniform in a region of linear dimension about 10 cm and area of cross-section about 10^(-3) m^2 . The maximum current-carrying capacity of a given coil of wire is 15 A and the number of turns per unit length that can be wound round a core is at most 1000 turns m^(-1) . Suggest some appropriate design particulars of a solenoid for the required purpose. Assume the core is not ferromagnetic.

    A uniform magnetic field of 100 G (IG=10^(-4)T) exists in a region of length about 10 cm and area of cross- section about 10^(-3)m^(2) . The maximum current carrying capacity of a given coil of wire is 15A and the number of turns per unit length that can be wound round a core is at most 1000 turns m^(-1) . How would you utils the coil to design a solenoid for the required purpose ? Assume the core is not ferromagnetic.

    Home
    Profile