Home
Class 12
PHYSICS
A magentic dipole in a constant magnetic...

A magentic dipole in a constant magnetic field has

A

zero potential energy when the torque is maximum.

B

minimum potential energy when the torque is maximum

C

maximum potential energy when the torque is maximum.

D

zero potential energy when the torque is minimum.

Text Solution

Verified by Experts

The correct Answer is:
A
When a magnetic dipole of dipole moment M is placed in a uniform magnetic field B, it will experience a torque,
`tau=MB sin theta`
Torque is maximum when `theta=90^(@), U=-MB cos theta=-MB cos 90^(@)=0`
Promotional Banner

Topper's Solved these Questions

  • MAGNETIC EFFECTS OF CURRENT

    VMC MODULES ENGLISH|Exercise JEE Advanced (Archive)|78 Videos

  • MAGNETIC EFFECTS OF CURRENT

    VMC MODULES ENGLISH|Exercise LEVEL 2|50 Videos

  • LIQUIDS

    VMC MODULES ENGLISH|Exercise JEE ADVANCED (LEVEL -2)|55 Videos

  • MOCK TEST 1

    VMC MODULES ENGLISH|Exercise PART I : PHYSICS (SECTION-2)|10 Videos

Similar Questions

Explore conceptually related problems

Find the ratio of magnetic dipole moment and magnetic field at the centre of a disc. Radius of disc is R and it is rotating at constant angular speed o about its axis. The disc is insulating and uniformly charged

A coil is placed in a constant magnetic field. The magnetic field is parallel to the plane of the coil as shown in Fig. 3.28. Find the emf induced in the coil if B increasing.

A magnetic dipole is acted upon by two magnetic fields with inclined to each other at an angle of 75^(@) . One of the fields has a magnitude of 15 mT. The dipole attains stable equilibrium at an angle of 30^(@) with this field. The magnitude of the other field (in mT) is close to

Sketch the magnetic field lines for a current-carrying circular loop near its centre. Replace the loop by an equivalent magnetic dipole and sketch the magnetic field lines near the centre of the dipole. Identify the difference.

Find an expression for the magnetic dipole moment and magnetic field induction at the center of Bohr's hypothetical hydrogen atom in the nth orbit of the electron in terms of universal constant.

A magnetic dipole is placed in a uniform magnetic field of intensity B, oriented along the direction of the field. If the magnetic dipole moment is M, then the maximum work an external agent can perform in rotating the dipole will be

Let r be the distance of a point on the axis of a magnetic dipole from its centre. The magnetic field at such a point is proportional to

Let r be the distance of a point on the axis of a magnetic dipole from its centre. The magnetic field at such a point is proportional to

Find an expression fot the magneitc dipole moment and magnetic field induction at the centre of Bohr'r hypothetical hydrogen atom in the n th orbit of the electron in terms of universal constant.

A dipole is placed in constant electric field E as shown . If it is released from rest this position find the kinetic energy gained when it is parallel to electric field vector . ( Assume dipole is small and placed in a gravity free space ) .

VMC MODULES ENGLISH-MAGNETIC EFFECTS OF CURRENT -JEE Main (Archive)
  1. A galvanometer has a 50 division scale. Bat- tery has no internal resi...

    Text Solution

    |

  2. In a certain region static electric and magentic fields exist. The mag...

    Text Solution

    |

  3. A magentic dipole in a constant magnetic field has

    Text Solution

    |

  4. A negative test charge is moving mear a long straight wire carrying a ...

    Text Solution

    |

  5. A uniform magnetic field B of 0.3 T is along the positive Z-direction....

    Text Solution

    |

  6. A magnetic needle of magnetic moment 6.7xx10^(-2)Am^(2) and moment of ...

    Text Solution

    |

  7. A proton a deuteron and an alpha - particle having the same kinetic en...

    Text Solution

    |

  8. The dipole moment of a circular loop carrying a current I, is m and th...

    Text Solution

    |

  9. A Helmholtz coil has a pair of loops, each withN turns and radius R. ...

    Text Solution

    |

  10. A current of 1 A flowing on the sides of an equilateral Delta of side ...

    Text Solution

    |

  11. A charge q is uniformly distributed on a non-conducting disc of radius...

    Text Solution

    |

  12. A particle having the same charge as of electron moves in a circular ...

    Text Solution

    |

  13. One of the two identical conducting wires of length L is bent in the f...

    Text Solution

    |

  14. A magnet of total magnetic moment 10^(-2)hati " A-m"^(2) is placed in ...

    Text Solution

    |

  15. A current loop, having two circular arcs jo ined by two radial lines i...

    Text Solution

    |

  16. A hoop and a solid cylinder of same mass and radius are made of a perm...

    Text Solution

    |

  17. An insulting thin rod of length l has a linear charge density rho(x)=r...

    Text Solution

    |

  18. The region between y =0 and y=d constains a magnetic field vecB = Bve...

    Text Solution

    |

  19. In an experiment ,electrons are accelerated from rest, by applying a v...

    Text Solution

    |

  20. As shown in the figure two infinitely long, identical wires are bent...

    Text Solution

    |