Home
Class 12
PHYSICS
A bar magnet of length 10 cm and having...

A bar magnet of length 10 cm and having the pole strength equal to `10^(-3)` weber is kept in a magnetic field having magnetic iduction equal to `4pixx10^(-3)` tesla it makes an anlge of `30^(@)` with the direction of magnetic induciotn the value of hte torque acting on the magnet is

A

`2pi xx10^(-7) nxxm`

B

`2pi xx10^(-5) nxxm`

C

`0.5 n xxm`

D

`0.5 xx10^(-2) n xxm`

Text Solution

Verified by Experts

The correct Answer is:
A
Torque `tau =MB_(H) sin theta`
`=0.1 xx10^(-3)xx4pixx10^(-3)xxsin 30^(@) =10^(-7) xx4pi xx1/2`
`=2pi xx10^(-7) Nxxm`
Promotional Banner

Topper's Solved these Questions

  • MAGNETOSTATICS

    MODERN PUBLICATION|Exercise MULTIPLE CHOICE QUESTION (LEVEL I) (ASSERTION AND REASONING)|2 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 bar of diamagnetic substance is placed in a magnetic field with its length making angle 30^@ with the direction of the magnetic field, the bar behaviour is given by the statement ?

What is the magnitude of magnetic force per unit length on a wire carrying a current of 8 A and making an angle of 30^@ with the direction of a uniform magnetic field of 0.15 T?

An electric dipole with dipole moment 4xx10^(-9) cm is aligned at 30^(@) with the direction of a uniform electric field of magnitude 5xx10^(4)NC^(-1) . Calculate the magnitude of the torque acting on the dipole.

A conductor of length 3m moving in a uniform magnetic field of strength 100 T. It covers a distance of 70 m in 5 sec. Its plane of motion makes an angle of 30^(@) with direction of magnetic field. Calculate the emf induced in it.

A magnet of length 12 cm has pole strength 10 units. Find out the torque acting on the magnet when it is placed at an angle of 30^@ with the direction of a uniform field of strength 0.5 oersted.

Magnetic field due to a bar magnet 2 cm long having a pole strength of 100 Am at a point 10 cm from each pole is

The moment of the couple acting on a bar magnet of moment 0.2 Am^(2) inclined at an angle 30^(@) to the direction of field 5 tesla is