Home
Class 12
PHYSICS
A short bar magnet of amgnetic moment 25...

A short bar magnet of amgnetic moment 25 `JT^(-1)` is placed with its axis perpendicular to earth the resultant field is inclined at `45^(@)` with earth field if `H=0.4xx10^(-4)`T

A

5m

B

0.5 m

C

2.5 m

D

0.25 m

Text Solution

Verified by Experts

The correct Answer is:
B
Since B and H are to each other and resultant field is inclined at an angle `45^(@)` with
so B=H
`therefore (mu_(0))/(4pi)(2M)/(r^(3))=H`
`therefore r^(3)=(mu_(0))/(4pi)(2M)/(H)=0.5 m`
Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • MAGNETOSTATICS

    MODERN PUBLICATION|Exercise MULTIPLE CHOICE QUESTION (LEVEL III)|2 Videos

  • MAGNETOSTATICS

    MODERN PUBLICATION|Exercise RECENT COMPETITIVE QUESTION|5 Videos

  • MAGNETOSTATICS

    MODERN PUBLICATION|Exercise MULTIPLE CHOICE QUESTION (LEVEL I)(PARAGRAPH QUESTIONS )|1 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

A short bar magnet of magnetic moment m=0.32 JT^(-1) is placed in a uniform magnetic field of 0.15 T. If the bar is free to rotate in the plane of the field, which orientation would correspond to its (a) stable and (b) unstable equilibrium? What is the potential energy of the magnetic in each case?

A circular coil of radius 10 cm, 500 turns and resistance 2 Omega is placed with its plane perpendicular to the horizontal component of the earth’s magnetic field. It is rotated about its vertical diameter through 180^@ in 0.25 s. Estimate the magnitudes of the emf and current induced in the coil. Horizontal component of the earth’s magnetic field at the place is 3.0 ×x 10^(-5) T.

Knowledge Check

  • A short bar magnet of magnetic moment 25JT^(-1) is placed with its axis perpendicular to earth's field direction. At what distance from the centre of the magnet, the resultant field is inclined at 45^(@) with earth's field, if H=0.4xx10^(-4)T .

    A
    5 m
    B
    0.5 m
    C
    2.5 m
    D
    0.25 m

  • A bar magnet has a magnetic moment 2.5 JT^(-1) and is placed in a magnetic field of 0.2 T work done in turning the magnet from parallel to antiparallel position relative to the field direction is

    A
    0.5 j
    B
    1 j
    C
    2.0 j
    D
    zero

  • Two identical magnetic dipole of magnetic moments 1.0 Am^(2) each placed at a separation of 2m with the resultant magnetic field at point midway between the dipole is

    A
    `5xx10^(-7) T`
    B
    `sqrt(5)xx10^(-7) T`
    C
    `10^(-7) T`
    D
    `2xx10^(-7)` T

    • Similar Questions

    Explore conceptually related problems

    A bar magnet has a magnetic moment of 2.5 JT^-1 and is placed in a magnetic field of 0.2 T. Work done in turning the magnet from parallel to antiparallel position relative to field direction is

    A short bar magnet has a magnetic moment of 0.48 JT^(-1) . Give the direction and magnitude of the magnetic field produced by the magnet at a distance of 10 cm from the centre of the magnet on (a) the axis, (b) the equatorial lines (normal bisector) of the magnet.

    A bar magnet of magnetic moment 1.5 JT^(-1) lies aligned with the direction of a uniform magnetic field of 0.22 T. (a) What is the amount of work required by an external torque to turn the magnet so as to align its magnetic moment: (i) normal to the field direction (ii) opposite to the field direction? (b) What is the torque on the magnet in cases (i) and (ii)?

    Two identicla short bar magnets each having magnetic moment of 10 am^(2) are arranged such that their axial lines are perpendicular to ech other and their centres 0.2 m the resultant magnetic inducito at a point midway betweeen them is

    A deflection magnetometer is set in tan A position. A short bar magnet of moment 4 A-m^(2) is placed on one of the arms with its axis in the direction of the earth's filed and with its centre at a distance of 0.2 m from the centre of the needle. Then the deflection in the compass box is found to be

    Home
    Profile